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Popular and correct spelling is with two T's. A unicorn with a clarinet as a horn. One can be a clarinetticorn by placing the bell of one's clarinet on their forehead and holding it there so that the rest of the clarinet sticks up like the horn of a unicorn. (usually done while running and/or making akward, loud noises).
Person 1: (running with their clarinet on their head) "AAAHH!!!"

Person 2: "dude, what's that guy doing"

Person 3: "oh he's just being a clarinetticorn"
by Clarinetticorn June 27, 2016
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