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During sex, either anal or doggy style, shit on your fist and deliver a violent jab to the face or back of your partner's head. The punch will only count as a shrek punch in the event sloppy greenish shit is used on the fist.
"Man, I'm never going to get a true shrek punch on Linda. My shit is always too solid and brown..."

"Don't worry, you'll get lucky one of these times. Just eat more Taco Bell and White Castle."
by Mike0286 March 02, 2008
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