When a man is pleasuring himself while watching porn, but accidentally cums right when it cuts to a scene of the man's asshole.
"Bro last night I boofnutted and I never want to watch porn again."
by Booflord December 8, 2020
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An idiot, a moron. Used interchangeably with 'zoomtard'.
Jason Metal is such a boofnut.
by dawsunn October 10, 2006
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