by Carlguy42 February 20, 2017
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Get the Grumpy mug.The act of defecating into one's Air Duct or AC System, causing a foul shit-like smell within the entire facility.
My Boss fired me and I got back at his Bitch Ass by giving the office a "Grumpy Muffler", that'll teach them!!
by Ass-lickin-lova December 12, 2023
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