Sharping

(verb) To mark the thigh of a woman during oral sex with a small mark or symbol using an indelible marker. Commonly done where the woman cannot easily see herself and meant to warn future partners that the woman has been "sharped" before.

Guy 1 "I was sharping that one chick, and I noticed your brand."
Guy 2 "Yeah, I went down on her. It looked like Jimmy and four other guys sharped her in the last few months too. Total skeez."
Guy 1 "Whore."