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
(not to be confused under any circumstances with menstruating, therefore, it's spelled with an a after the m, and not an e): very offensive, for men to be incessantly quetching and complaining about this and that, and pentoute not behaving like a typical pragmatic rational male.
advice for men who hate their boss: stop manstruating about how you hate your boss and don't make enough money, read John Gray's Men are from Mars, women are from Venus, and then behave like a rational, pragmatic male by changing jobs.
by Sexydimma October 17, 2013
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
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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