From Rap Dictionary
- Derived from simpleton, used for rhyming with pimp. Short baby I ain't no simp, but the nigga in the suit ain't nothin' but a pimp -- Too $hort (Cocktales [??]).
- Someone that gets played by women instead of being the player. The opposite of a pimp.
To sing and pimp, from Boyz II Men: Simpin' ain't easy.