Piss Backwards 

To retract what you have previously said. Used by the Police (unofficially) to describe the actions of a victim - usually of domestic assault, who initially complains resultig on the offender being arrested, but then changes their mind and welcomes their tormentor back with open arms.

"Get her statement now, before she has chance to piss backwards"

Piss Backwards by Tex982 October 21, 2006