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One who is behaving like a really large douche bag. More ill-tempered than a mere douche bag.
Tom was being such a douchopotamus today. Way worse than usual.
by ImNotReallyAWaitress July 29, 2010
Someone who is a big fat douche...
Look at that Douchopotamus over there. If she forgets to stop chewing when she finishes that sub she's going to gnaw her hands off.
by Frozen Goat June 01, 2011