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1.
A dude who walks around in public with a visibly erect penis.
Oh my God! It looks like Mike is wearing sweatpants without underwear again, and he's turned on. What a unikorn!
by Peter Phil McCracken March 10, 2009
 
2.
It is when something or someone is Beyond Awesome. When awesome isnt enought to describe the word.
Wow this Chinese food is so total Unikorn, it blows my mind.
by Mindy & Brandon November 03, 2009
 
3.
a delightfully eccentric woman who is also drop dead adorable
One of my favorite things to do is bonking to unikorns online, all night long.
by Alley Cats October 26, 2011