plumbjacking

1. Attempting to create a vacuum in a vagina by thrusting a penis in and out of it at a particular angle so as to cause a quief.

2. Giving someone a hand job while they are taking a shit.

"My dick is so big, I totally plumbjacked that bar skank last night."

Guy 1: "She just came in to the bathroom and started plumbjacking me."

Guy 2: "Right in the freakin restaurant?"

Guy 1: "Hell yeah, man."

Guy 2: "Freakin sweet."