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When you have anal sex with a woman and get her diarrhea on your penis.
Bob: "Dude, Jenny gave me a total shat dack last night."
Jim: "I'd still tap that ass."

Guy1: "You're such a shat dack."
Guy2: "Isn't that when you get shat on your dack?"
by pocketpotato April 10, 2014
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