A person who doesn't sleep with a pillow
My roommate does not sleep with a pillow. She is an alien.
by shiroshitsuji September 10, 2014
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A member of the huge fanbase of the german pop-rock band Tokio Hotel.

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Timmy: "Hey Sue, aren't you a really big fan of that German band Tokio Hotel?"

Sue: Yeah, I'm an Alien! Tokio Hotel is the bomb!"
by Aliensuchtliebe February 16, 2012
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A sexual maneuver, in which a female/male is in the process of giving oral pleasure, and has to almost unhinge her jaw in order to her her lips around the males penis.
Dude the other night my girlfriend had to do the alien in order to get my dick in her mouth!
by mrrwbrown November 27, 2013
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Adjective. Something strange and unfamiliar or inexplicable.
Josh: You ate 15 twinkies in a minute?

Jeff: (mouth full, nodding)

Josh: That is fuckin aliens!
by Jeff Stumpf May 8, 2008
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Someone who is wrong about something but will continue to convince you that YOU are wrong until you're forced to agree to get out of it. Typically these people all look skinny and alien like.
Alex: "The earth is flat and its been proven". Me: "How has it been proven? The earth is not flat" Alex: "Dude the earth is like totally flat what are you talking about dude are you retarded do you see a curve?" Me: "SHUT UP ALIEN."
by sarcasticviolence June 20, 2019
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spooky bois from space that party with them soilders in area 51
Wow there’s an alien inside of my chicken parmasean!
by definetlynotcow July 18, 2019
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