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1. Changing direction or course wildly and without any fucking rhyme or reason.
"What's wrong with her? Dude who knows... her mood fuctuates so often, I don't even try to keep up."

note: Redneck dictionary usage ( typically after someone lets out a particularly nasty round of flatulence )
"Good Lord Bubba!! What the fuct-u-ate!??"
by The Original Pez May 13, 2008
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