I'm so pissed!

气死我了

He's mad at you.

他生你气呢

mad about意思是“痴迷于”，别搞混

I'm mad about Star War. 我超迷《星战》

Failing the test really upsets me.

考试挂科真的让我很不爽

形容词upsetting，“令人不爽的”

This is so upsetting. 这太不爽了

I'm all blowing up!

我已经气炸了

I'm about to explode.

我快被气炸了

be about to， 将要做某事。

It drives me crazy.

我要疯了

Why are you making me angry?

你为什么老让我生气?

It burns me up when I see you.

我一见到你就生气

You piss me off!

你惹怒我了

piss off意思是“使生气”，

I'm freaking out right now.

我现在很是抓狂

I'm mad as hell.

我好气