In The Kissing Booth 2 (2020), Elle is not impressed with her dance partner, Marco:
Elle: Oh, my God! The big deal is that the competition is literally in four weeks -and the routine is a complete nightmare!
Marco: I think you're exaggerating.
Elle: No, listen, if you don't want to take this seriously, we should just call it off.
Marco: Okay, time out. So I'm using every free hour I have, practicing into the night for this competition that you asked me to help you with, just so I could screw things up for you?
What does "screw things up for you" mean?
I heard "screw sb up", but what does this word mean?