1 definition by Gurgal

Top Definition
When a unicorn is born with a mutant deficiency that adds an extra horn to its head, thus becoming a two horned unicorn, or twonicorn.
Person 1: I saw a unicorn today!

Person 2: Even better, I saw a twonicorn!

Person 1: What's a twonicorn?

Person 2: A unicorn with two horns.

Person 1: lol
by Gurgal February 25, 2010

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