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?
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