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A Peenutter is a guy that goes into a public bathroom to use the urinal and while peeing, moans like he is nutting or ejaculating.
Bob- "Man, i was in the bathroom and this guy came in to take a piss and was moaning like he was getting his dick sucked."

Brett- "Yeah he sounds like a real Peenutter."
by uncommonkamann July 13, 2012
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