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A girl who is PMSing and/or being a total bitch. Whining, complaining, and crazy emotional outburts are all traits of a menstrosity
Babe: Did you hear Jillian screaming and ranting about how unfair life is?

Greg: Yeah, she was being a total menstrosity.
by Bambino624 December 03, 2008
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What your beautiful, wonderful, kind, loving and nurturing wife, finace or girlfriend turns into when their monthly visitor comes to call. Similar to the transformation that occurs with someone who has been bitten by a Werewolf. A total and complete transformation into an irrational, instinct and hormone driven raging beast.

Similar to Monstosity:

1. an outrageous or ugly person or thing; monster
2. the state or quality of being monstrous

But directly caused by a visit from aunt flow
Joe: "Hey Frank, can I come and stay with you for a week, Betsy has turned into a complete menstrosity."

Frank: "No problem bro, I feel your pain."
by BigBlackBlick May 21, 2010
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