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One who acts completely irrational or generally like an idiot but with vehement conviction. Said person usually brings about a 'car crash phenomenon' where something is gruesome, but you just can't look away.
"Becky was such an octotwat, she tried to get a beetle drunk"

"Tom Cruise is such an octotwat, everyone knows Katie is his beard"
by Twat-o-pus October 23, 2006
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