pit fiend 

A powerful type of Devil in the Dungeons and Dragons roleplaying game.

Pit Fiends are among the most powerful creatures in the Nine Hells.

pit fiend by Jeff Chislett May 17, 2004

pit fiend 

n. A person (especially a woman) who sweats from the underarms profusely and often smells offensively.

v. 1. To sweat profusely from the underarms. 2. To smell like a pit fiend.

That bitch is fine, but she a pit fiend.

pit fiend by Miryam Websta April 26, 2004

pit fiend 

A woman who becomes violently angry and crazed while ragging, as if her cooter were possessed by some powerful evil force.

Guy 1: My girlfriend's all PMSy and been throwing shit and screaming and crying a lot lately.
Guy 2: Definitely a pit fiend. I'd run.

pit fiend by ShaggyShaggs June 4, 2005