Hacked off

Hacked off is an adjective that means angry. Here are some examples:

Sue: "What are you so hacked off about?"

James: "I accidentally deleted my report and now I have to rewrite the whole thing!"

John was hacked off about the increase in his rent, so he decided to look for another flat.

Bob: "I'm a little hacked off about the new policy, how about you?"

Phoebe: "Yeah, I know what you mean!"

As you can see, we usually put about after hacked off and before the cause of the anger. But if you're angry at a person, you could put at: "I'm hacked off at Jennifer because she cancelled our meeting again!"