Top Definition
n. a woman's belief that, when she is having her period, she is exempt from normal standards of social appropriateness and nicety, as well as being immune to the confines of logical thought and behavior.
I asked Mary how she was doing, she flicked me off and told me to "Shut the f#%* up. She thinks that's an OK way to act since she's got menstrual immunity.  
by igomi24 June 12, 2010

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