Tainted knuckles occur when you reach between your legs to wipe your ass after a shit and your knuckles touch the vile soup in the toilet bowl or,heaven forbid,the turd itself.
Damn! I'm going to have to wash my hand.I got tainted knuckles.
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Someone that shoves all their fingers into a females vagina, so that their knuckles are touching the taint...
Dude my bro Jackson just taint knuckled Rhonda.