pmbb

Stands for: Poke My Belly Button.
If you poke your belly button, your bum falls off.
Used as a less vulgar version of "lmfao."

Derives from eccentric grandmothers who use obscure terms.

#1: Oh PMBB!
#2: Okay.
#1: <bum falls off>

by rachebjacol November 05, 2009