Definitions by Sue Don M.

derp 

A word used after a stupid joke, or stupid slapstick. It was first used in the South Park episode "The Succubus," but popularized by later episodes. Commonly used to refer to jokes in Rob Schneider movies.

Rob Schneider derp da derp! Then, derp da derp ta tittily tum.

derp by Sue Don M. December 29, 2007