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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
1197 705
mysical horse-like creatures with a single horn in the center of their head. when a man is masturbating under a rainbow, crying, and using his tears for lube, and his seed spills to the ground, that is how a unicorn is conjured.
my sorry D&D character died today in battle, so i went out to let off some steam, and all of a sudden this unicorn appeared out of nowhere! i love unicorns!
by hotasset January 15, 2008
51 65
1. a mythical beast with the body and head of a horse, legs of a stag, tail of a lion, and single horn in the middle of the forehead.
2. a singularity of grotesque freakishness, likened to the mythical creature of the same name.
did you see that bitch with the tight striped pants? I could see her bulging stretch-marks, doo-doo stains, and a foot-wide cameltoe. what a unicorn.
by poo-nonymous October 22, 2006
12 26
A person you know that is your perfect match, and you could always picture yourself being with them...but you can't have them, or have never dated them, or they have kept you in the friend zone.
Remember my best friend Jimmy Jackson from high school? He is totally my unicorn.
by alexa7590 October 03, 2008
86 101
a horse with a horn stuck on his head
when drunk randomly putting a snooker cue 2 ur head and randomly sayin "im a unicorn" here by creating the still existant and popular sayin of currie high school
In Harry Potter
"im a unicorn!"
by random_bulldog November 03, 2003
12 27
you know when u get a report card and ur teacher gave u a "U"? Well it stands for unicorn, as D stands for dolphin.
"no mother i did not get an unsatisfactory grade on my report card u must have mistaken it, i got a unicorn on my report card."
by Rosa February 27, 2004
13 29
Tasty with A1 sauce, grilled over an open flame.
Mmmmm, this Unicorn is very tender.
by Moose September 23, 2003
28 44
A lesbian.
They are wanted by men but mainly unattainable.
"Jen is so hot...too bad she's a unicorn."
by Kippie November 01, 2006
9 26