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 15, 2011
anytime a man is acting like a girl i.e emotional, irrational, etc.. its is said that they are manstruating
dude did you see dan?!! he was watching the notebook and started crying, he must be manstruating.
by nicas4life July 05, 2008
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 19, 2010
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
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 28, 2014
A monthly three to five day period when a man seems particularly moody, weak, emotional or indecisive.
Dude 1: "Hey, have you talked to Jeremy lately? He started to cry when I told him he had a flat."

Dude 2: "Oh, leave Jeremy alone. He's manstruating. He'll be better in a couple of days."
by Robert the Great February 04, 2013
The male version of the menstrual cycle.
A man period.
The male version of PMS.
I'm cranky. I must be manstruating.
by Lancelot1 August 12, 2006
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