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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 Cholo79 April 15, 2008
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(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
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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 15, 2011
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manstruate, manstruation
masculine variation on menstruate,
When a man displays behavior that is reminiscent of mood swings brought on by the female monthy cycle.
Brian has been a bitch all day; he must be manstruating.
by Peter Thomas October 12, 2005
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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
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The time of the month when men display the same characteristics of women during their "time of the month." Generally consists of elevated bitchiness, lack of compassion for others, and intense hunger. Steer clear of boyfriends, fathers, and husbands during this time. Things could get UGLY.

Also known as man-cycle.
Tom was such a brat last night. He must be manstruating.
by Manduh420 June 15, 2007
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