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1 definition by Grand Marnier

 
1.
1. To inexplicably change from a reasonable human being to an incoherent, raving asshat with little or no warning.
i.e. Going from zero to douche in nothing flat.
"We were having a perfectly nice lunch until my coworker decided to prick up when the waiter brought him the unsweet tea he asked for instead of a sweet tea."
by Grand Marnier October 19, 2012