When a male is going through a period of increased irritability and moodiness.
Geez, Jermaine, what's up with HB? He's been so pissy lately. He must be manstruating. Give him a manpon.
by Pucas Leters April 15, 2008
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When a guy gets really hormonal and PMS-y. They get random mood swings. It comes more often than once a month.
John was very moody Saturday. He must have been manstruating.
by 4564315 May 16, 2011
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Men with blue balls/male period all month acting like nagging ass little bitches.
Damn, are you manstruating because your acting like a little whining bitch!
by Deecee February 26, 2015
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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."
by TinaTheGinger March 28, 2013
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When a man is "on the rag."
"I think Chad must be manstruating again. He was being a real dick last night.
by Hophead July 11, 2008
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A man who is in the act of being grumpy moody.
Hey guys, sorry I am a little down today. I'm manstruating.
by Scordinosaur February 20, 2010
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When a male is in a mood considered grumpy or lonely.

Usually occurs once a month.
Manstruation is very bothersome to all of this particular male's friends.

a.k.a. Man Period
Dude, he is in such a funk.

Yeah, he's manstruating.
by DrCakeMan64 January 29, 2014
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