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When one shits on the top of anothers head and the shit is in the shape of a coiled up snake. Inspired by the 80's pop-rock band "Devo".
"So when I was in Germany this really kinky bitch gave me a wicked Devo Hat."
by Morris Town Crunch Jr. May 10, 2007
(Noun) When a man's uncircumcised penis is really tiny and the foreskin appears to coil up like a Devo Hat.
Baby, your flaccid penis looks likes a Devo Hat. Whip it good!
by Fatsie Mc Doo Doo Face June 06, 2011