When your having sex with a girl and she starts menstruating and you pull out after leaving a load, and the semen and menstrual fluids start coming out and mixing together making this dirty ass goop.

Also used after calling a guy, usually Korean, Semen. When his name is Simon. It is to take it to a 2nd level of name morphing
Sebastian - yo Semen
Simon - fuck you Sebastard
Sebastian - easy there semenstruation

Simon - i was totally banging this chick when i felt something weird so i pulled out after letting a load in. she semenstruated everywhere.
by Constapator June 16, 2010
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The excess semen that flows out of the woman's vagina after sexual intercourse between a male and female.
After a night of of passionate sex Allie began to semenstruate as she walked into the kitchen to get a mid-night snack...she quickly grabbed a paper towel and wiped up the semen just as it ran down the inner thigh of her leg.
by gonzo words December 27, 2011
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