I will open your ass (ani iftach lech ta'tahat)
a Hebrew phrase used when someone is so angry, they think your butt is the worst thing ever and they want to tear it apart like it's a bad pizza.
My dad said it when I told him I was moving to another country.
My sister used it when I took her phone and played games for an hour.
My teacher said it when I drew on the desks with marker.