Top Definition
Origin: R. Crumb, 1960s-era underground comic artist. A bitch with an ass so big and bubbled that the top actually forms a shelf or seat, possibly large enough for an averaged-sized commuter to ride to work.
Steve: Yo, check out the booty!
Paul: She's the big ass monorail headin' downtown!
by Dick Knibbler November 20, 2007
5 Words related to big ass monorail

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