Hoe back

A former gf or girl you knew when you were in school. She still lives in the same area and so when you're back in town, you visit her for casual sex.

Ranks between the side bitch and jump-off in terms of social obligations.

Terry: I'm going to my parents this weekend and maybe have a coffee with Eleanor as well.
Doug: She's your hoe back?
Terry: No, she's my ex. It's just coffee, period.
Doug: You misspelled hoe back.