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.
To kick someone in the crotch (e.g. the "fork" of the legs) so hard that it lifts him or her off the ground. Not as effective against females.
Guy 1: Hey, did you see DBZ last night?
Guy 2: Yeah, man! Goku forklifted Vegeta into space!
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