Top Definition
When a person becomes so horribly obese that when they stand up their backside looks as if it could accomodate a family of four.
Ed: Bro, your mom has a friggen assbench! Check that thing out, I could like put a glass of water on top of it and it wouldn't spill! hahaah

Phil: ....=(
by mrfizzwidget398 July 23, 2009
6 Words related to assbench

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