A pair of tattoos running down the back of a girl's calves. The tattoos in question are usually either a bow with a pair of ribbons going down the back of each calf, or a heart with a single line extending down the back each calf, but there are many other variations. Emo/alternative/goth girls are common to be found with these tattoos.
Guy 1: "Yo, I heard that guy's girlfriend has calf ribbons!"
Guy 2: "Wow, is she an emo?"