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1.
When you're having a pillow fight, and the pillow moves away from your hand mid-swing, causing you to accidentally punch the person with less than an inch of pillow between the fist and them. Normally it hurts both parties.
"Oh my god, I'm so sorry, I didn't mean to pillow punch you!"

"I was at the World Wide Pillow Fight, and someone totally pillow punched me."
by Moggeh November 12, 2008