Circle dater
Someone who systematically dates every person in a group of friends. Usually occurring in groups of high school girls with similar personalities or appearances.
"Man, did you hear Eric is dating Brianna now?"
"I thought he took her beat friend to prom?"
"Yeah, he'll be after Emily next. That guy's such a circle dater."
"I thought he took her beat friend to prom?"
"Yeah, he'll be after Emily next. That guy's such a circle dater."