to ruin everything
Tu veux tout foutre en l'air ?
Do you want to screw everything up?
Je te laisserai pas tout foutre en l'air, salope !
I won't let you screw everything up, you bitch!
— Mademoiselle (2016)
You're going to screw everything up.
Il allait tout foutre en l'air.
He was going to screw everything up.
Il pourrait tout foutre en l'air.
He could screw everything up.