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1.
This happens when when you hook up with a girl at her house or apartment. After sexy time, you take dump in one of her slippers. The next morning when she puts on her slippers, you yell, "DIRTY SLIPPER!" and smack her in the face, then run out of the house screaming and laughing.
"Dude, I gave Jen the dirty slipper lat night!"
"Wow man, that's pretty damn gross."
by steve-n-craig January 18, 2014