look up any word, like cleveland steamer:
 
1.
Colloquial; Synonym for hot bi babe or HBB, often derogatory, condescending, or ironic. A bisexual person, usually though not always female, who is willing to join an existing couple, often with the presumption that this person will date and become sexually involved with both members of that couple, and not demand anything or do anything which might cause problems or inconvenience to that couple.

The term is often used to be dismissive of a couple seen to be only superficially polyamorous. Because of the demands that this type of couple places on the woman (that she be single and not take on any additional partners, and become involved with both members of the couple equally, and often "complete" their family as a surrogate mother and housekeeper and/or breadwinner and not do anything that may threaten or disrupt the existing couple), many in the poly community call this type of woman a "unicorn", as in mythical and not likely to be found, even though there are plenty of bipoly women around.

Sometimes the unicorn is expected to not develop any emotional attachment and is strictly there for a sexual relationship (equally distributed to both members of the dyad) and/or is prescripted as a secondary. This term is used as a reminder that bipoly women are people with their own desires, needs, and pre-existing lives, and not fantasy figures or pets. See related prescriptive vs. descriptive.
John wants a single, attractive woman who will love and have sex equally with him and his wife, but not interfere with their marriage, move in together, help raise their kids but not have any of her own, and not have any other partners. He's looking for something that doesn't exist - he's looking for a unicorn!
by Joreth April 08, 2010
 
22.
A virgin.
"I was a unicorn in high school. I didn't lose my horn until I met your father."
by Pear's Megzo January 11, 2014
 
23.
an extremely attractive person that you've heard stories about and seen pictures and movies of but have never seen them in person. (just like the mythical creature the unicorn)
yeah bro i've never seen her before. Shes a total unicorn
by kimurablair November 02, 2010
 
24.
A strange and rare girl, rather mystical. A virgin girl in High School
Ohh man, she's a Unicorn, no way can I try that
by Eddie10 July 20, 2010
 
25.
1. Horses with horns on heads.
2. SEXY.
3. PLEASE BREAK FOR ME
"There are a bunch of unicorns in my house."
by ploopster March 13, 2005
 
26.
1.) The last of the race, which believe that kissing or any express of romantic/sexual gestures should be kept for real love.

2.) Anyone that hasn't been kissed
R: Hey look! Ella and Leaha are unicorns! They're so cool
by ellaandleaha October 09, 2012
 
27.
A person who seems mythically beautiful and unattainable.
I'd had a crush since I was 13; she was my unicorn.
by S.I. Cake June 08, 2005
 
28.
a style of flicking someone off by holding you middle finger up near your head to look like a unicorn

-mostly used while riding a bike
That boy who lives down the block rode by my house on his bike and gave me the unicorn.
by urworsthacker01 December 30, 2011