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(verb) To clench together one's butt cheeks to prevent a serious accident in their pants.
"Dude, pull the car over. I am plenching and about to soil the seat cover." shouted Brad after Thanksgiving dinner.

Steven tried to plench following his dinner at the Mexican restaurant, but it was to late. The runs started down his leg creating a small puddle on the floor.
by joebooh2 December 03, 2006
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The sexual act of sucking jello off of a male's penis, often with vacuum like force.
Guy 1: "bro, Jessica totally wanted to plench me last night at the party"
Guy 2: "damn bro, you should've gone for it! to receive a plench is a once in a lifetime opportunity"
by Ottergod February 25, 2019
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