The act of sticking one's tongue in a car's tailpipe, especially when for sexual pleasure.
I saw this sexy Ferrari, and I just had to give it a trupkin.
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When you stick your tongue up a car's ass. Created by Robert Benfer on the podcast Chaos Pony for the segment "Robert Creates a Word."
George: John, what were you doing last night?
John: Oh, I was just doing some trupkin.
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