| 1. | Thumb Plumb | ||
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When a person jams their finger in their butt hole to prevent diarrhea from spilling into their pants -Dude, is that guy scratching his ass in class?
-Naw man, that guy's doing a Thumb Plumb |
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| 2. | Thumb Plumb | ||
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A thumb plumb is when there is a lump of shit left on the thumb after thumbing an arse. Holy shit, you should have seen the size of the thumb plumb she left.
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