What it means
Being brassed off means you’re properly annoyed and fed up, like you’ve had it up to here and your patience has packed its bags. It’s a classic British grumble for work hassles, rubbish service, delays, or the weather doing your head in. Sounds a bit old-school, but it still pops up when someone’s about to kick off.
Usage examples
"I’m brassed off, mate, the bus is late again and the boss is ringing nonstop. If I miss this shift, I’m done."
"I am well brassed off with this train line, third delay this week and not so much as an apology."
"He came home brassed off after another pointless meeting that could have been a two-line email."
Where it comes from
Comes from forces slang, where the brass meant the top officers with their gleaming buttons and braid. Being brassed off was being thoroughly fed up with them and their endless orders, and the grumble marched out of the barracks straight into everyday British moaning.
Other ways to say it
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