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The opposite of a brainstorm; an incredibly stupid thought or idea--stupid enough, possibly, to have literally come from the thinker's butt.
Guy: Egads! I've just had a brainstorm! We'll use that chair to reach the roof, then elope to Vegas!
Girl: ...That's more of a buttstorm than a brainstorm.
by Sovios Falchion Romantic May 29, 2007
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