A tumor on one of your buttcheeks that resembles a weiner.
He showed me his buttweiner in the locker room. I told him to go get that thing checked out.
by mandyman January 31, 2009
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An act of outright, manly defiance characterized by quickly showing one's enemy one's butt cheeks, then quickly turning around to show the weiner.

Known to inspire fear in the hearts of most.
"Jarrod tried to steal my toilet paper so i buttweinered him."
by Petey B December 4, 2004
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