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When a perfectly sane and logical girl that turns into a raging bitch at a "certain time" of the month. Reasons may or may not be related to PMS.

Unlike Werewolves, however, Werebitches are still aware of their actions the following day, yet they won't own up to it.
Man 1: "Lucy is a really sweet girl, but she totally lashed out on me last night all of the sudden."
Man 2: "Dude, it's normal, it was just that time when she turns into raging Werebitch."
by yazter May 29, 2011