When someone has had anal sex and that persons partner ejaculated inside of her (or him in the case that is was gay sex.) The person is left with jizz dripping from her butt the next day.
Bro: AWW I gave Beth the WORST drippy butt last night!
Bro 2: Really??
Bro: Yeah bro, look, her jeans are all wet.
The act of extracting the spatter from the severely protruding, excessively moist; prolapsed anus of the bloke you are currently underneath, who is on the downward section of a 50KG well above limit power sqaut at around 3am at a seedy, 24hr gym.
Seen johnno the other morning, sneaking a drippyspaff off some poor cunt at the gym.