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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
1194 704
 
8.
The rare creature who is able to give you the thing you always wanted but thought you you could never have.
"You fell in love with a unicorn. It was beautiful, then sad, then sadder. I laughed, I cried, I puked in my mouth a little. And honestly, I kind of get it."
by lilyrosa July 31, 2013
37 24
 
9.
A mysterious creature born from the mating of a narwhal and a horse, they are given the horn of the narwhal, the body and head of a horse, and a beauty like no other. It is common for them to be in odd colors, such as blue or purple, the rarer ones are gold or silver. Due to the fact that a unicorn horn can be used to overthrow the government, they have been hunted to near extinction. Now there are only small clans of unicorns, but if you can find one, treasure it and soon it will grow wings and you will become king of the world.
Guy 1: I found a tribe of Unicorns!
Guy 2: Now we can overthrow the evil anarchy of the government!
by TheUnicornRider December 15, 2012
33 27
 
10.
the most majestical and amazing creature to be in existence ever.
you performed really well, like a unicorn
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11.
A pretty girl or woman that loves comic books, sci-fi and gaming. They're out there, but it's impossible to catch one.
"Look at the unicorn buying the X-Men comics"
by Bubble Shoot October 24, 2011
65 63
 
12.
As rare a real unicorn is. This fascinating sexual experience is when a female giving you fellatio starts to migrate south to your butthole. As she tosses your salad she begins to jerk your member. At this specific moment, she resembles a unicorn polishing her horn (your penis). Yes, it is as magnificent, rare, and pleasurable as it sounds. I would recommend that if any of my fellow alpha males find a women that expresses her love of the unicorn that you wife her IMMEDIATELY. Enjoy!
While the fugazi started to give me head, she went down, started eating my ass and jerking me off and the same damn time. I unicorned that bitch bro!

Female: Hey baby! Make me into a unicorn!
by Tugey November 24, 2013
43 42
 
13.
The polite way of calling some a Dickhead.
He's is a right unicorn off a boss
by Telenikros July 06, 2014
0 0
 
14.
An acquaintance that you, yet not your friends, desire although you know little to nothing about him/her. The mythical and enigmatic reference pertains to your unfamiliarity with your person of desire and the reason for the attraction in the first place.
"I heard you went home with your unicorn last night!...yeah?"
by ISeeBoredPeople December 03, 2008
31 31