When a guy starts acting really crabby, and complaining much like a woman on her period.
Eric: "I am sick and tired of cleaning up your crap, Paul. Keep it on your side of the room!"
Paul: "Woah, sorry dude. No need to manstruate at me- I'll clean it up!"
James: "Dude, what's up with Jeff? He's been really crabby lately."
Harry: "Yea, I know. He's probably manstruating."
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