Dink dirt is the accumulation of various bodily fluids (yours or someone else's) that build up in the crease around the head of a mans penis or under the foreskin if he doesn't clean properly after sexual contact.
Mike: "Fuck man, I went down on Watson last night, and he had some serious dink dirt going on!"

Jeff: "Dude, that is fucking disgusting.... Watson always struck me as having pretty good personal hygeine."

Mike: "Well he doesn't! I have never smelled anything so horrid in my whole life! I can't keep seeing him anymore, I'm just so grossed out."
by Jennifiend April 08, 2007

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