Times during the month when Men are more emotional and have a difficult time coping with their daily lives.
They could be acting crazy, crying, selfish, impatient, insecure or just plain annoying. Basically like a woman on her period.
Joe Blow, "BLAH BLAH BLAH, I hate everything, my life sucks and no one likes me. I wish I had a girlfriend."
Suzy Somebody, "Joe must be Manstruating." "Hey Joe, you better go plug up your mouth with a tampon. Im sick of listening to you bitch."