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A stain left behind after having sex with a fat and/or ugly person that reminds you of the terrible act you performed the night before.
Eric: "Ew! What's that on your bed?"

Terry: "Oh, thats just my Shame Stain from last night."

Eric: "Was that the triple chinned asian from the bar?"

Terry: "If only. (Sigh)"
by Brock Doody January 20, 2011