Having sex with a girl that is on her period.
John was not discouraged by the fact that his girlfriend is on the rag and performed the dirty moses.
by archibole sans December 31, 2008
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When three guys are peeing in urinals and the two guys on the outside piss on the guy in the middle.

Moses parted the ocean and then closed it on the bad guys.
Guys, I just got hit with a dirty Moses and now I smell.

I think we should hit this guy with a dirty Moses.
by TaquavionTavuis March 1, 2022
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1. The act of doing someone wrong with the full intent of screwing them over to an unfathomable degree.

2. Trolling someone with the end result being that they are left in a substantially worse position than before.
"did you hear that Josh took a dump in the foil liners of Matthew's stove top?"
"oh shit! That's dirty Moses"
by Heeeydevon July 14, 2022
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