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."
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