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
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