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Buttoon is a lengthened form of "butt." In other words, it is someone's rear end. It is a harmless, mild-mannered, and fun term.
Hey! You must have sat on something because you got a big spot on your buttoon!

Can you please move your big buttoon off my papers? What a big butt.

They are trimming their buttoons and bellies with exercise
by Alosauria May 14, 2011
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