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The feeling of craziness, confusion, or emotionally instability during a women's menstrual cycle.
My girlfriend feelings are so unpredictable; anger, sadness, and confusion are all so periodic.

Her periodic feelings are always something to run from this time of the month.
by Rena J June 16, 2016
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A super gay homo faggot that is gay that owns a faggot owned CS:GO server for gay surfing.
Have you seen Periodic? HE IS SO GAY!
by OMGArtiIsEar November 06, 2017
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