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1 definition by Fishballs

 
1.
The days when your man friend/spouse/partner/coworker etc. acts like a total intolerable douchebag when he is otherwise decent.
'Manstruation is wreaking havoc on Bob. He just told me to f*ck myself after I asked him to wipe large chunks of Pop Tart off of his expense report.'
by Fishballs December 02, 2008