Hopper

A girl or a guy, that hops from one person to another after being rejected, or simply not liking them anymore. Changes frequently, from every few weeks to months.

Guy: Yoo did you know every one is calling Annie a Hopper now?

Guy 2: Why what did she do?
Guy: She just hopped from Kyle to Kevin after being rejected by Kyle, now she's flirting with him. Watch her hop to another guy next month.