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PMB stands for Penis Memory Block. It's used to describe the trauma that occurs when a woman's been sleeping with the same man for so long she can only remember what HIS penis looks like and has no recollection of her former lovers' goods.
One day Sandra realised she could no longer remember what her ex-boyfriends penis looked like. Or any other penis for that matter; all she could see was Geoff's...

"Noooooooooooo!" she cried. "I have PMB!"

Her friends were very sympathetic.
by GMCarangi January 23, 2008
8 19
The initials which stand for a group known as "Pensacola's Most Boners" (P.M.B.)
This is basically the males in the city of Pensacola who receive the most sexual intercourse.
(Guy 1) Dude! I've had sex with 4 different girls this week!

(Guy 2) You should be in PMB!
by Most Boners January 24, 2009
6 23