The act of taking a shit and piss on your partner's chest and then sliding through it and splashing it on their face like the Pittsburgh Plunge ride at Kennywood. Also similar to a Slip N Slide.
Dan: "Hey Rose do you want to try the Pittsburgh Plunge?!"
Rose: "Sure! I hope you have diarreah so its extra slippery!"
When a woman clogs the toilet with a rank ass shit and the man cleans it up with the plunger, then fucks her anally, while the dirty plunger is on her head.
I gave that nasty bitch a Pittsburg Plunger, that's what she gets for clogging my pipes