A brunette walks into a bar and says, Gimme an M L. The bartender says, What's an M L?

A brunette walks into a bar and says, "Gimme an M L." The bartender says, "What's an M L?
" The brunette says, "A Miller Light." Another brunette walks in and says, "Gimme a B L" The bartender says, "What's a B L?
" She says, "Bud Light." A dumb blonde walks in and says, "Gimme a 15." The bartender says, "What's a fifteen?
" The blonde says, "7&7, duh!
"