If I'm late again, my boss's gonna blow a fuse.

如果我再迟到，老板一定会很生气。

To blow a fuse means to become very angry.

火冒三丈的意思是变得非常生气。

A " short circuit" can also cause you to " blow a fuse" (fuse).

“短路”也会让你“烧断保险丝”（fuse）。

" To blow a fuse" means that there is too much power running and the electrical system shuts down.

“熔断保险丝”意味着运行的电力过多，电气系统关闭。