50-11 (pronounced fitty-lebbem) represents the number 550, in the pimpin' game.
It is actually fifty times eleven, which equals 550.
Pimp 1: "Man I ain't no Gorilla Pimp. I got me 7 bitches who bring dat money home to ME! Everythang's gravy baby!
Pimp 2: " You just a Popcorn! I got 50-11 Ho's and ain't a day goes past, dat I don't kick 20-10 of 'em in their motherfuckin' ass!