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(idiomatic expression) syn. of nutter, wacko.

Popularized by the Australian electronic music group the avalanches in their song "Frontier Psychiatrist".
You’re a nut! you’re crazy in the coconut!

I don't claim to know what Mel thinks, and i don't really care. What is pretty clear is that the man is crazy in the coconut.
by New Marquis de Carabas March 06, 2007