Top Definition
n. A person SO lazy, they think having fun takes too much effort to be worth it. Buttwumpi can't even be bothered to play video games or channel surf. Surprisingly, most are thin, as unlike couch potatoes, they are too lazy to eat much.
"You can 'just sit there' at the club, too, but at least there you'll get a lap dance while you're at it! Don't be such a buttwumpus!"
by Zotmeister July 16, 2008
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