When a man is in a shitty mood for an extended period of time. similar to a womans pms.
1st guy: I don't know whats wrong with that guy he's been in a shitty mood all week.

2nd guy: Yeah i guess hes manstrating.
by Douchebahg January 25, 2010
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A guy who is really irritable, bitchy and indecisive. Just like girls on their period. Basically, a man who is menstruating.
Before the Partwii, Lauren, the cyborg, bus surfed over to Mickey D’s with his brofriend Chuck Norris and bought a McGangbang happy meal with the funds that he jacked from his sugar momma after his disco nap that afternoon. Chuck pulled out his phone from his nuthuggers and started sexting a ginger slice with a tramp stamp that he had been friendly following ever since they shared a game of Jager pong. Lauren gave Chuck the air jerk as he noticed Tanasa the grade digger that sat next to him in his art class. Lauren gave her the “let’s just be friends” nod and grabbed his happy meal. As Lauren walked outside he saw, Bruce, the designated drunk, as he started wailing teenybopper show tunes. Bruce was manstrating again and wanted his fix of Dr. Pepper and Big league chew. The night of celebrating Lauren’s nomotion had barely even started and already he was knackered.
by Micron X February 24, 2010
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When she just got back from a week at her grandmother's house and hasn't been touched in forever so you just take one for the team and after like the sixth time in a half hour that you've cummed it doesn't even feel good at all it's just incredibly painful but you keep going because she's still horny and finally on the seventh time when your dick is just shouting out "STOP STOP" you have a weak hellaciously painful nothing of an ejaculation and realize that blood just came out your dick.
Doctor: You've ruptured your vas diverenze, seminal vescicals, popped one testical and backed up your epididimus with coagulated blood and seman. if you have sex again in the next year you will die. How did this happen?

You: Manstration
by The Lonliet Monk December 31, 2008
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when a man has taken it hard in the ass and needs to wear a kotex to absorb the fluids,is in a bitchy mood and won't have sex for a week
what is that lump in his shorts,he must be manstrating. that poor bastaed
by JEFF KOWALSKI March 13, 2008
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The socially awkward pass-through, crotch stain common to active hemorrhoid bleeding; similar to a ‘menstration skid’, but more common to the opposite gender.
Damn, check it out. Do you think we should tell him that he’s got a funky thing goin’ on in his shorts?
Let’s give it a bit of time; wait until he starts leaving manstration marks on the furniture.
Right. That way he won’t think that we’re just fuckin’ with him.
by YAWA October 4, 2021
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Men who behave like they have excessive levels of estrogen.
He will really manstrate when he has to pick up the last job .
by edyer June 22, 2017
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