Etymology: From the slang expression "Having one's head up one's ass," thus, wearing the ass as a hat. The term is extended to people who are clueless or bumbling, who don't understand what is going on.http://www.iidb.org/vbb/showthread.php?t=215296 New battle in my vandalism war"Some snaps off my Darwin Fish last Saturday. Time to replace it and find a new bit of heretical bling to put back there."
(cattag2, Internet, slang): asshole.
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