1. A bum which has, engraved upon it, a ripple pattern, often a result of sitting upon textured or ridged surfaces for an extensive period of time.
2. A bum which has a pattern upon it, akin to the side of a potato chip, like a ripple.
K: Holy crap!
K: hahaha!! what better way to start my day than seeing your rippled-potato-chip bums in my head lol xD i hope they've plumped right back up now hahah :D
F: LoL! bums!