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 pad for your period
Kristy: Hey I Just Got My sparkle do you have a rainbow
Kate: no sorry i just have a unicorn
by Shajenjen July 22, 2011
A word referring to the drug marijuana.
"Yesterday I smoked almost an ounce of unicorns with my homies I was so baked."

"Aye can I buy some unicorns of you cause I'm going to a party later?"
by The Notorious Big May 26, 2011
A Unicorn is a gentlemen of African American decent that plays professional hockey in the United States of America. They are called such because it is such a rare occurrence to spot one in the NHL that their mythic status is often compared to the fabled Unicorn.
Bro #1: Bro we went to the hockey game and I saw a Unicorn
Bro #2: No way I thought those didn't exist
by Oston from Evers April 18, 2011
A rare mystical, magical creature.
A white girl with a large ass.
"Look, that girl is such a unicorn!"

"Dangggg, i'd tap that!)
by AliceonE March 17, 2011
A mythical and elusive poop. You you felt it come out, but there is no smell, no fecal transfer on the toilet paper and you will see nothing in the bowl except, in some cases, the very tip of a horn.

The opposite of the Minotaur.
I took my morning shit already, but I'm not really satisfied. I'm sure something came out, but it was a unicorn.
by hot carl sagan January 03, 2011
A sexual act in which the female attaches a strap-on to her forehead and inserts it into the male's anus, thrusting vigorously.
Brett took that unicorn from Dani all night long.
by Ekaj69 December 06, 2010
A sex position in which a man puts his erect penis in the middle of a woman's forhead and ejaculates.

It can also be the act of drooping a limp penis over the forehead of a woman fom either behind or the front of her face.
Hey, what did you do yesterday?
Oh, I unicorned a few chicks back at my house.
by Period5LunchTable October 26, 2010

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