I'm going to curse my co-worker out
What is making you so angry at him?
He smacked me on my back.
It's not very respectful to curse out your co-worker and it's not advisable. You should just talk to him seriously about how you didn't like what he did and ask him to stop. Two wrongs don't make a right.
We just fight a lot.
I think that you should both get on the same page. You should not curse out your coworker though, it is not very nice.