When someone ties (or whatever you prefer) a horn around his/hers head and sticks it in a vagina.

Once one has finished this process it is called Unicorned.
Bob: Baby wana see what unicorn-ing is?

Marissa: What's that?

Bob: oh you'll see.....

Marissa: WOW! that was great!

Bob: ikr, how do you like being unicorned?
by IPityTheFoo November 16, 2011

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Taking a shit in a Pringles can and sticking it to someone's windshield of their car. (Making their car a unicorn)
We bough a bunch cans of Pringles and once they were gone were went around Unicorning every car in the parking lot.
by HelenKellerxxx May 14, 2016

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A software trick used by the authors of the Wikipedia's Visual Editor software, that sometimes makes it appear invisible unicorn-shaped characters in the text.
The article I was edited was broken because of all that unicorning.
by dialmove December 29, 2015

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To fist a girl in the anal region or in the vaginal area with your middle finger sticking up.
Hey babe, I'm gonna be unicorning you all night long
by TheTaterBater March 18, 2015

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A term used to describe a person who, at work, magically dissappears and reappears throughtout the work, leaving you and your co-workers wondering where they go to waste time.
"Hey Jim, have you seen Corky?"
"No, he's unicorning again, there's no telling what he's up to."
by cj2liz February 11, 2015

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The new hottest dance move sweeping America, Oceania and the rest of the world. Chicks gobble your weiner after you unicorn.
Hot Girl: Damn look at that boy unicorning all over the place.

Hot Girl 2: Lets double team him.
by Chamster November 01, 2009

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When a girl spreads her legs, and you strap a dildo to your head then you bounce up and down between on your knees between her legs until she climaxes.

Unicorned: Talking about when you were unicorning
Yo me and Suzy were unicorning all night last night

Yo me and Suzy unicorned all night last night
by Big Sexy Joey Moss November 15, 2016

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