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1.
"shit in a cup" is a noun referring to, obviously, a piece of shit in any type of cup (glass, plastic, etc.).
Guy 1: "Do you want to stop at that gas station to go to the bathroom"?

Guy 2: "Nah, I'll just take a shit in this cup"

Guy 3: "OH GROSS! Get rid of that shit in a cup!"
by guitarplaya11243 November 26, 2009