Top Definition
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
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
A unicorn is a mythical, horse like creature. A unicorn has a horn on it's forehead and typically a long, flowing mane.
Unicorns are often symbolized for their majesticness and beauty.
by Techno Blaze April 27, 2015
A fabulous horse with a horn on its head that farts out rainbows all though very simular to a Pegasus in many aspects the unicorn can't fly.
Use full unicorn facts:
·A group a unicorns is called a blessing
·Drinking their blood will make you immortal
·There horn is magical
·They are the national animal of Scotland
·They are know extinct because Noah excluded them from the ark (this one is just legend)
Person: hey what's the coolest animal.

There's one really fabulous one :Person 2
Person: which one is that?

The unicorn of course :Person 2
by the unicorn of banterbry March 29, 2015
A unicorn is a extremely attractive man/woman who is dating someone who is way less than average looking. The term unicorn is used to describe it because, 1) it was some magical/mythical shit they got together. 2) there is no way it will ever happen again (once in a lifetime type thing) 3) the extremely less than average looking one will never do anything to lose his/her unicorn.
That's a unicorn
by Ms. MAS March 10, 2015
A unicorn is an individual that has all of the ideals and qualities that you are looking for in another human. Like the mystical horned creature, you may never see one of these in person, only in dreams.
I met this guy I thought was a unicorn but turns out he is ___ (insert appropriate word).
by Native_Enimga December 07, 2009
Related to armadillos and rhinos, unicorns are a usually white horse-resembling creature with rainbow hair and a pink and purple horn. Have been mistaken to narwhals, but narwhals are actually unihippocampi. Not related to horses or pegasi, as they do not exist. A unicorn is quite real and one dies everytime someone breaks a promise, tells a lie, or has an awkward silence. Unicorns also have the power to grant you wishes.
*Awkward silence*
by summersunshine.dabeep February 15, 2015
when you attatch a strap-on onto the top of your head and let loose
"i once unicorned that bitch"
by ching wang November 17, 2014
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