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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

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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

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The upper class of the equestrian world. Because of their magical powers and sociopathic tendencies, they are typically land owners, government officials, and general rich, pompous douche bags. They often look down on and exploit the other species- most especially the ponies. Because of their arrogant, self centered nature, and frequent impotence on the part of the male, they have a high divorce rate and combined with the likelihood of being hunted down by goblins for their magical horn, consequently low population- much to the relief of the other species.
That unicorn paid the police to evict all the ponies from their land. I hope he's hunted down by goblins.
by BS234 March 20, 2015

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Cute fluffy creature with a magical cone on its head that farts rainbows.
"Oh, my gosh look at that fluffy unicorn! He's so fluffy, I'm gonna die!" -Agnes
by GTA_lover99 March 28, 2015

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A Unicorn can refer to a man or a woman and is often used to describe the perfect catch or perfect partner. A Unicorn is a mythical creature, someone amazing who is hard to catch or simply a very rare find. The term is often describing someone who is remarkably attractive (above a 7.9), but not at all batshit crazy, amazing at sex, and has a great personality. This definition is used more often to describe this scenario than in reference to LGBT themes. Gay or straight however you can be a Unicorn because you're beautiful, amazing, fuck like a god/goddess, not crazy as fuck, awesome to be around and even going somewhere with your life. Hot but down to earth? You may be a Unicorn. People will try to catch the Unicorn as if hoping to bring this magical energy in their life but the Unicorn knows only to reveal themselves to the worthy. This makes the encounter all the more magical because it's not a trick of the light it's a mystical mythical magical babe that makes you feel so lucky because you never thought you could find someone amazing as them. Careful, these folks can make the hard of heart easily fall in love.
What made you stop messing around with multiple ladies at once?

Man: Because I met a Unicorn. Her name is Lindsay.

Did you meet a Unicorn at the Gay bar tonight?

Cool gay guy: Yes I did, but it's not because they are gay, but because they are amazing.

What level of hotness and personality do you go for Sarah?

Sarah: Unicorn level.

Amy who is your favorite mythical creature?

Amy: John is.

You're girlfriend is crazy amazing!

Girl: I found out she's actually a Unicorn.
by LunaPhase January 08, 2017

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It's when you lay down flat on you back, face up, with a dildo suctioned to your forehead, and your partner squats down over your head, and inserts the dildo into one of their orafaces, then bounces up and down over you while singing The Irish Rovers, The Unicorn Song.
I was unicorned last night
by Yankee Cranker February 06, 2015

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Unicorns are amazing, sparkling creatures. They're magical and very lovable! Unicorns are the most amazing creature EVER & if you don't believe in them you're crazy! They're kind of like majestic, sparkly horses with a horn on the top of their head. YAY UNICORNS!
The unicorn walked among the clouds and over the rainbow.
by TotesAGirlyGirl June 22, 2016

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Term frequently used at Dickinson College to refer to a beautiful, unobtainable crush with whom the likelihood of hooking up is akin to stumbling upon a unicorn in a mythical forest. Many a student will attempt to capture said unicorn but such efforts are nearly always fruitless, leaving the unicorn untouchable and free to gallop through campus unrestrained in its magical beauty.
Look! I see my unicorn across the caf. I almost talked to them at Alabi's this weekend
by Suckmyskittles March 03, 2015

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