(Informal) Angry, fed up, very upset, exasperated.
Translation to Spanish: Muy enfadado, muy enojado, muy irritado.
Pronunciation: Bress of (American) – Brass off – (UK)
☞ I’m absolutely brassed off with all this talk and false promises….
British of unknown origin
Also: Brassed Off: is a 1996 British film about the troubles faced by a brass band in a coal mining community following the closure of their pit. (wikiquote)
Movie: Falling Down – Michael Douglas – Totally Brassed Off