RWP is an acronym for Re-Wipe and Pee. It occurs when one goes to the bathroom to pee, but uses the stall because the burning and itching indicates further cleanup of the anal sphincter is required. The phenomenon is often associated with the day after a long night of drinking. When a turd has no distinct ending multiple re-wipes are often necessary. If the condition persists, it can turn into BRWP which stand for Bloody Re-Wipe and Pee.
Dude, I was out drinking last night and have massive swamp ass. I have to go RWP.