The act of taping a beer can to a passed out friend's forehead. Accomplished with one empty beer can some tape.
Jon: Jaeger got unicorned and the fag is sitting on his face.

Teggs: Sucks to be him.
by NJITdrinksFACE July 02, 2010
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Unicorned (verb)--the process of being impaled in some way by a unicorn, usually the horn on its head. There is no proof that this can be done since no-one has ever seen one of these in the first place.
Officer: Your Mom and Dad was recently unicorned yesterday while trying to find the land of unicorns...thus, they had entrusted you everything they had in their will.

Son: O_O......YES! I GET EVERYTHING! THANK YOU GOD!
by The one above all December 20, 2009
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When you take your testicles and gently put them in the eye sockets of a sleeping friend while at the same time getting aroused and having a full erection thus making them a unicorn.
"Dude if I find out one of you guys unicorned me i'm going to take out the time to personally assassinate each one of you"
by Flappy98 July 15, 2012
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When having missionary sex and you punch the girl in the forhead and leave a red mark.
So i had her on the bed and was taking that ass hard then i unicorned her.
by Keljoran September 06, 2014
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Strapping a dildo to your head and charging full throttle and drilling the recipient in the vagina or anus.
by Diamond Cutter (Pres) January 20, 2005
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