Why do Israelis say yalla so much? It's a Arabic word, what's up with that

About 2 weeks ago my friend raped me. We're both guys. We were very high on weed, but I was way more stoned than he was. I think he thought I wouldn't remember or something. I didn't talk to him since, I avoided and ghosted him. I'm not sure what to do. It is not legal to smoke weed here. I feel disgusting.