I dump your ass
Saying 'I dump your ass' is like throwing a punch and saying you're gonna beat them up again later. It's for people who are annoying and you're trying to win them back just to annoy them more.
I dump your ass, Emma! You're the worst friend ever and I'm gonna make you feel it!
I dump your ass, Liam! You called me a chicken and I'm gonna make you eat it!
I dump your ass, Zoe! You said you'd help me with homework and then you left me hanging!