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noun, disease affecting a person or an animal in a way were they cant stop thinking of crazy unicorns. this usually gets them in trouble but the person with the disease is most likely hardcore enabling them to squeeze out of tight situations. no cure discovered.
that girl alwasys has unicorns on her head, she must hace UNICORNHEAD.
by seaunicorn May 10, 2008
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2
Unicorn Head means that a girl/guy is dressed as a unicorn while giving head so hard that the guys genitals start to turn different colors like a rainbow
Guy 1: Dude this girl last night gave me unicorn head

Guy 2: No way dude how many colors
Guy 1: All of them
by GummyBear25 May 28, 2017
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