Its when you place a hard penis on someones forehead. The balls will also be resting on their head. It resembles a unicorn. Placing a soft penis on someones head is baby unicorning. And if this takes place in a pool or water it is known as narwhaling.
During a party you find a passed out person and place your hard dick on their forehead, balls at the base of the forehead, this is known as unicorning.
by KPUSF January 17, 2014
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A startup worth over one billion dollars. At risk of becoming complacent or stagnant
Evernote is a unicorn; unfortunately its value has dropped because of stagnant user growth startup
by tomorrowtomorrow December 7, 2015
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n. YOU-ni-corn
A unicorn is a magical animal that can only be seen by the purest of the pure-hearted. Ancient accounts suggest that unicorns look like a horse with a spiraled horn protruding from the middle of its forehead. Not to be confused with a Pegasus.

Unicorns are majestic creatures, and some say that from one touch of their horn, they can heal anything.

A more modern twist to the mythological beast is that unicorns can fly without wings. Instead, they are propelled by the rainbows they fart out. They have been known to sneeze skittles and poop ice cream, and eat anything with sugar in it.

A unicorn must never be captured, as when it is, it turns into something looking like a large, orange, slimy object with one eye and a toupee. If this happens, it means that the unicorn has lost all their magical abilities and their will to live, along with their beauty and their brains, so they are basically a lump o slime and nothing else.
Luckily, as the purest or the pure-hearted never do such things, this has never happened, but if you do see someone attempting to push a large, neighing, invisible mass into a cage, then please stop them, as it is debated that the capture of a unicorn will lead to the destruction of humanity.
Some believe that Donald Trump is a captured unicorn.
If you see a flying horse with a horn pooping rainbows, it is probably a unicorn.
by LittleMissLily May 7, 2017
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a magical horse with a horn on the middle o its forehead that missed noahs arks boarding!
kid: oh look mom its a sparkly horse!
mom: oh no sweetie thats a unicorn.
teenager: nope.. that has to be edward cullen as a horse...
by blllleeeeeeeeeeep May 18, 2011
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A sexual theatrical play where one partner attaches a strap on dildo and proceeds to penetrate the receiving partner with said dildo strap on.
Buddy: how was the white knuckler last night?
Me: she was into some wierd shit. I had to put a strap on my head, unicorning the fuck out of her
by Doctor_chang.aka.hung-lo January 9, 2014
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A unicorn orgasm is like the greatest orgasm ever. Your body/parts of your body go numb. You have muscle spasms that last longer than the sex. It lasts longer than your average joe or orgasms and you don't think it'll ever stop. It's almost like you black out and go to a different world for that period of time. Sometimes you cry after. Your whole body is tense and relaxed at the same time. And you feel like a teenager again because you don't want to stop. It's. That. Good.
If you're not unicorning , then your partner needs to learn sex .
by Unicorning July 20, 2017
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a trio of unwordly proportions. spawned from montreal, canada, this threesome makes more infectious synth pop than you could ever hope to.
After seeing The Unicorns live, i knew my life was then complete.
by bri June 23, 2004
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