When a girl makes very noticeable changes to her appearance (ex. dying or cutting her hair, wearing
particularly sexy clothes) before meeting up with her ex-boyfriend - who is usually the one who left her - a short period of time after
the break up to "grab a coffee" or "get her stuff back". This is
supposed to have the effect of a shock for the guy, who feels like he's already missed out on a lot and like she's doing great and moving on without him. The goal is to make him ultimately regret his decision.