M bag

A scrotum with a letter M on it. Usually seen on extremely fucked up mario queers.

Guy: *fucks Girl hard*

Girl: *moans*

Guy: *jizzes in Girl's pussy*

Girl: *looks at Guy's M bag* Omg, I had sex with a fucking nerd!

Guy: Oh shit! *teleports away like a...wierd...person?*

Girl: What the fuck?