Top 28 Slang For Alien – Meaning & Usage

Aliens, the mysterious beings from outer space, have captivated our imaginations for years. But have you ever wondered what slang terms we use to describe these extraterrestrial visitors? Our team has compiled a list of the coolest and most intriguing slang for aliens that will have you seeing the universe in a whole new light. Get ready to dive into this listicle and expand your alien lexicon!

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1. E.T.

This term is derived from the famous movie “E.T. the Extra-Terrestrial” and is used to refer to beings or creatures from outside of Earth. It is often used to describe any form of alien life.

For example, “Do you believe in E.T.?”
In a discussion about UFO sightings, someone might say, “I think I saw an E.T. last night.”
A science fiction fan might exclaim, “E.T. is one of the most iconic aliens in movie history!”

2. Martian

This slang term specifically refers to beings or creatures from the planet Mars. It is often used to describe fictional aliens or as a playful way to refer to someone or something strange.

For instance, “Watch out for those Martians!”
In a conversation about space exploration, someone might ask, “Do you think there could be Martians living on Mars?”
A science enthusiast might say, “I find the idea of Martians fascinating.”

3. Grey

This term is used to describe a specific type of alien commonly depicted in popular culture. Greys are often depicted as small, hairless beings with large heads and black eyes. The term “Grey” is derived from their greyish skin color.

For example, “Have you ever heard of the Grey aliens?”
In a discussion about alien encounters, someone might claim, “I saw a Grey in my backyard last night.”
A conspiracy theorist might say, “The government is hiding the truth about the Grey aliens!”

4. Little Green Men

This slang term refers to small, green-skinned beings often depicted as aliens in popular culture. It is a playful way to refer to aliens in general, regardless of their actual appearance.

For instance, “Do you believe in little green men?”
In a conversation about science fiction movies, someone might say, “I love how little green men are portrayed in films.”
A skeptic might dismiss the idea of aliens by saying, “I don’t believe in little green men.”

5. Space Invader

This term is inspired by the classic video game “Space Invaders” and is used to describe aliens or extraterrestrial beings who invade or intrude upon Earth. It implies a sense of threat or invasion from outer space.

For example, “We need to prepare for a potential space invader attack.”
In a discussion about science fiction literature, someone might mention, “Space invaders are a common theme in alien invasion stories.”
A fan of alien-themed video games might say, “I love playing games where you have to defend Earth from space invaders!”

6. Xenomorph

Xenomorph is a term used to describe the extraterrestrial creature from the “Alien” film franchise. It is known for its aggressive nature, sharp claws, and elongated head. The term “xenomorph” is derived from the Greek words “xeno” meaning “strange” or “foreign” and “morph” meaning “form” or “shape”.

For example, a fan of the “Alien” movies might say, “The xenomorph is one of the most iconic creatures in science fiction.”
In a discussion about movie monsters, someone might mention, “The xenomorph’s design is both terrifying and fascinating.”
A person dressing up as a xenomorph for Halloween might say, “I can’t wait to scare everyone with my xenomorph costume!”

7. Roswellian

The term “Roswellian” is used to describe anything related to the Roswell UFO incident that occurred in 1947. It refers to the crash of an unidentified flying object in Roswell, New Mexico, and the subsequent conspiracy theories and government cover-up surrounding the event.

For instance, a person interested in UFOs might say, “I’m fascinated by all things Roswellian.”
In a discussion about conspiracy theories, someone might mention, “The Roswellian incident is often cited as evidence of a government cover-up.”
A fan of alien-themed TV shows might say, “I love watching documentaries about the Roswellian incident and hearing different theories about what really happened.”

8. Star Being

The term “star being” is used to describe an extraterrestrial being or creature that originates from a star or another celestial body. It implies that the being is not from Earth and has come from outer space.

For example, in a science fiction novel, a character might encounter a star being and say, “I couldn’t believe my eyes when I saw the majestic star being floating in front of me.”
In a discussion about the possibility of life on other planets, someone might speculate, “If star beings exist, they could have advanced technology we can’t even imagine.”
A person interested in astrology and extraterrestrial life might say, “I often wonder if star beings have visited Earth in the past.”

9. Space Cadet

The term “space cadet” is used to describe someone who is perceived as being out of touch with reality or having a dreamy, absent-minded demeanor. It is often used playfully to refer to someone who is easily distracted or has a tendency to daydream.

For instance, a person who frequently forgets things might say, “Sorry, I’m such a space cadet sometimes.”
In a lighthearted conversation about personality traits, someone might say, “I’m definitely a space cadet when it comes to remembering people’s names.”
A friend teasingly commenting on someone’s absent-mindedness might say, “You’re such a space cadet, always losing your keys!”

10. Interstellar Traveler

An interstellar traveler is a being or creature that travels between star systems. It implies that the being is not from Earth and has the ability to traverse vast distances in space.

For example, in a science fiction movie, a character might encounter an interstellar traveler and say, “I never thought I’d meet an actual interstellar traveler in my lifetime.”
In a discussion about the possibilities of advanced civilizations, someone might speculate, “Interstellar travelers could have knowledge and technology far beyond our understanding.”
A person interested in space exploration and astronomy might say, “I often wonder if there are interstellar travelers observing us from afar.”

11. Cosmic Visitor

This term refers to an extraterrestrial being or entity that comes from another planet or galaxy. It implies a sense of awe and wonder at the idea of beings from outer space visiting Earth.

For example, in science fiction literature, you might read about a cosmic visitor who comes to Earth to study human civilization.
In a conversation about UFO sightings, someone might say, “I believe that cosmic visitors have been observing us for centuries.”
A conspiracy theorist might claim, “The government is hiding evidence of cosmic visitors in Area 51.”

12. UFO Occupant

This term specifically refers to an alien being that is believed to be piloting or occupying an unidentified flying object (UFO). It suggests the idea of extraterrestrial intelligence and technology.

For instance, in accounts of UFO encounters, witnesses often describe seeing strange UFO occupants with non-human features.
In a discussion about conspiracy theories, someone might claim, “UFO occupants have been secretly influencing human history.”
A UFO enthusiast might say, “I believe that UFO occupants are studying Earth to learn about our civilization.”

13. Alien Lifeform

This term describes any living creature or organism that originates from a planet or celestial body other than Earth. It encompasses a wide range of possible forms and species.

For example, in science fiction movies, you might see alien lifeforms with unique physical characteristics and abilities.
In a conversation about the search for extraterrestrial life, someone might say, “Scientists are actively looking for evidence of alien lifeforms in the universe.”
A believer in the existence of aliens might argue, “The diversity of life on Earth suggests that alien lifeforms could exist in other parts of the universe.”

14. Extraterrestrial Being

This term refers to any living being or entity that originates from a planet or celestial body other than Earth. It emphasizes the idea of beings that are fundamentally different from humans and come from distant parts of the universe.

For instance, in science fiction literature, you might read about encounters with extraterrestrial beings that possess advanced technology and intelligence.
In a discussion about the potential for alien contact, someone might say, “Extraterrestrial beings could have vastly different biology and societal structures.”
A UFO researcher might argue, “The existence of extraterrestrial beings would have profound implications for our understanding of the universe and our place in it.”

15. Space Creature

This term describes any living creature or organism that originates from outer space, regardless of whether it comes from a specific planet or celestial body. It suggests the idea of strange and unknown lifeforms that exist beyond Earth.

For example, in science fiction movies, you might see space creatures that are depicted as bizarre and often dangerous.
In a conversation about the possibility of life on other planets, someone might say, “Space creatures could have evolved under completely different conditions than life on Earth.”
A fan of science fiction might speculate, “I wonder what kind of space creatures could exist in the vastness of the universe.”

16. Space Oddity

This term refers to an alien that is considered strange or peculiar. It is often used to describe aliens that are different from what is typically portrayed in popular culture.

For example, in a science fiction novel, a character might encounter a space oddity with multiple limbs and unusual physical features.
In a discussion about UFO sightings, someone might claim to have seen a space oddity hovering in the sky.
A conspiracy theorist might argue, “The government is hiding the truth about space oddities visiting Earth.”

17. Cosmic Entity

This term refers to an alien that is believed to come from a cosmic or otherworldly realm. It implies a higher level of power and intelligence compared to typical aliens.

For instance, in a fantasy novel, a cosmic entity might be depicted as a god-like being with immense powers.
In a discussion about the existence of extraterrestrial life, someone might speculate about the possibility of cosmic entities visiting Earth.
A believer in paranormal phenomena might claim to have had a supernatural encounter with a cosmic entity.

18. Alien Invader

This term describes an alien that is perceived as a threat or enemy. It implies that the alien has invaded or infiltrated a place, often with malicious intent.

For example, in a science fiction movie, the plot might revolve around a group of humans defending Earth against an alien invader.
In a discussion about the potential dangers of contact with extraterrestrial life, someone might express concern about the possibility of an alien invader.
A conspiracy theorist might claim, “The government is secretly collaborating with alien invaders to control the world.”

19. Interplanetary Traveler

This term refers to an alien that is known to travel between different planets or celestial bodies. It implies a sense of exploration and adventure.

For instance, in a science fiction story, an interplanetary traveler might visit Earth to learn about human civilization.
In a discussion about the possibility of life on other planets, someone might speculate about the existence of interplanetary travelers.
A science enthusiast might say, “Interplanetary travelers could hold the key to unlocking the mysteries of the universe.”

20. Roswell

This term is associated with the Roswell UFO incident, which occurred in 1947. It refers to the crash of an alleged extraterrestrial spacecraft near Roswell, New Mexico, and has become synonymous with the idea of aliens visiting Earth.

For example, in a conversation about UFO sightings, someone might mention the Roswell incident as one of the most famous cases.
In a discussion about conspiracy theories, someone might argue that the Roswell incident was a cover-up by the government to hide evidence of alien activity.
A believer in extraterrestrial life might say, “The Roswell incident is proof that aliens have been visiting Earth for decades.”

21. UFO

This term refers to any object or phenomenon in the sky that cannot be identified by the observer. It is commonly associated with extraterrestrial spacecraft.

For example, “I saw a strange light in the sky last night, it could have been a UFO.”
In a conversation about conspiracy theories, someone might mention, “There are many reports of UFO sightings near military bases.”
A person discussing the possibility of alien life might say, “UFOs could be evidence of intelligent beings from other planets.”

22. Otherworldly Being

This term refers to a being that originates from a realm or planet other than Earth. It is often used to describe an entity that is not human or from this world.

For example, in science fiction movies, you might hear, “The protagonist encountered a group of otherworldly beings on their journey.”
In a discussion about paranormal phenomena, someone might say, “Many believe that UFO sightings are evidence of otherworldly beings visiting Earth.”
A person interested in mythology might mention, “Legends from various cultures often include stories of encounters with otherworldly beings.”

23. Alien Visitor

This term refers to an extraterrestrial being who visits Earth. It is often used to describe encounters or sightings of creatures or entities that are believed to be from another planet or galaxy.

For instance, in conspiracy theories, people might claim, “There have been numerous reports of alien visitors at military bases.”
In a discussion about unidentified flying objects, someone might say, “Many believe that UFOs are actually alien visitors.”
A person interested in extraterrestrial life might mention, “The search for evidence of alien visitors is a major focus of scientific research.”

24. Area 51 Resident

This term refers to a being or creature that is believed to reside in Area 51, a highly classified United States Air Force facility. It is often used to describe extraterrestrial beings that are rumored to be held or studied at this location.

For example, in conspiracy theories, people might claim, “Area 51 residents include captured aliens.”
In a discussion about government secrets, someone might say, “Many believe that Area 51 is home to extraterrestrial residents.”
A person interested in UFO sightings might mention, “Some eyewitnesses claim to have seen Area 51 residents during their encounters with unidentified flying objects.”

25. ETI

This term refers to intelligent life that exists outside of Earth. It is often used to discuss the possibility of advanced civilizations or beings from other planets or galaxies.

For instance, in discussions about the search for extraterrestrial life, scientists might refer to “ETI” as a potential discovery.
In a conversation about the Drake Equation, someone might say, “The equation attempts to estimate the number of ETI civilizations in our galaxy.”
A person interested in astrobiology might mention, “The study of ETI is a fascinating field that explores the potential for life beyond Earth.”

26. Alien Entity

This term refers to a being or creature that originates from a place outside of Earth. It is often used to describe an unknown or mysterious entity that is believed to be of extraterrestrial origin.

For example, in paranormal investigations, people might refer to “alien entities” when discussing encounters with unidentified beings.
In a discussion about ancient astronaut theories, someone might say, “Many ancient texts describe interactions with alien entities.”
A person interested in ufology might mention, “The study of alien entities involves analyzing eyewitness accounts and physical evidence related to UFO sightings.”

27. Galactic Traveler

This term refers to an extraterrestrial being or creature that travels through space. It is often used to describe an alien who is exploring or visiting different galaxies.

For example, in science fiction novels, you might come across a character who encounters a galactic traveler.
In discussions about possible life on other planets, someone might speculate, “Imagine if galactic travelers made contact with us.”
A fan of sci-fi movies might say, “I love stories that feature epic battles between humans and galactic travelers.”

28. Alien Presence

This term is used to describe the existence or appearance of an alien. It suggests that there is a presence from another world or dimension.

For instance, in conspiracy theories, people might claim to have witnessed an alien presence on Earth.
In discussions about UFO sightings, someone might say, “I believe there is an alien presence among us.”
A person interested in the paranormal might ask, “Have you ever experienced an encounter with an otherworldly being?”