A hollaback girl is a girl that was ghosted by someone whether it was a romantic interest, partner, a friend, or acquaintance.
As usual the person that ghosted the girl messages the girl after a week, a month, a year of no contact etc. Expecting for the girl to be a desperate doormat and still single .
If the girl is smart, she would ignore the ghoster or "Rick Roll" the ghoster with Gwen Stephanie's song "Hollaback Girl".
Another name for a Hollaback Girl is a Callback girl.
That guy I talked to a decade ago ....well it was really 2 months ago just messaged me back. I leveled up and already found a guy wayy better. I'll hope he doesn't mind if I meme him with this 2000s song Hollaback Girl. Loser!