To go a long period of time without being a bitch, then to suddenly unleash your full bitchatude on a poor unsuspecting person.
Many: What do you want for lunch?
Sheila: Bitch, I don't want any food because my stupid teacher gave me an F for the semester.

Manny: Calm down Sheila your having a Rebitchlapse.
by DarkBlazer September 4, 2011
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