A momentary and intense display of irrationality, bad temper, insanity, or any combination thereof.
Ashley: WHAT THE HELL HAPPENED TO MY CHEESE?! I am going to cut the b**** that got my cheese all dirty! Who--
Roommate: Dude, chill. That's the blue cheese I bought today for the dinner salads tonight.
Ashley: Oops, I guess i had a redhead moment.