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A Fnoop is when you flatten out your hand like a high 5 but hold your hand palm-side up and charge it into someone's stomach when they're not expecting it.
"I saw Darla a little while ago and she fnooped me. I still have the feeling on my stomach"

"Aw that sucks, I hate getting fnooped, it hurts."
by Shinigamis like apples June 05, 2009
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