Bathgate Drainpipe Share definition Flag The act of peeing in a girl's bum, then having here fart over your face, thus covering you in your own urine, like standing under a burst drainpipe This regular anal sex isn't doing it for me, I'm gonna need a Bathgate Drainpipe to get off Bathgate Drainpipe by Biblical Fartings January 26, 2011 Get the Bathgate Drainpipe mug.