Definitions by Dick Knibbler

big ass monorail

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!

big ass monorail by Dick Knibbler December 28, 2007