This happens when a guy complains like a woman when she's having her period.
Grow some balls, clean the sand out of your vagina and don't manstruate in my house 'cause "Sewing with Nancy" was cancelled.
by Riemer August 4, 2006
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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 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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(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 18, 2013
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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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n. To become moody, bloated, and generally vaginal. only applicable to males.

v: -ing -ate -ated
archaic: manstrizzling
You can tell by his pissy attitude and bloody underwear that he's going through manstruation.

She went out with his best friend, so he's all manstruating and shit.
by Hanibal Sonderegger March 17, 2004
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