Brass bands were being discussed today which naturally led to someone claiming to be brassed off about something, meaning disgruntled or annoyed. Does anyone know the origin of this expression? Michael Quinion over at World Wide Words suggests the phrase may have arisen from the Royal Navy's use of cleaning brasswork as a punishment, but that doesn't seem altogether convincing.
This NGram suggests brassed off came later than brass monkey, as used in the expression cold enough to freeze the balls/nose off a brass monkey. I know some of the earlier usages for brass monkey here don't actually have that figurative meaning, but plenty do.
In light of that, I would simply say that "brassed off" actually derives from the earlier expression. If you've been kept hanging about in the cold, that's a typical situation where you'd be "brassed off".
Huge numbers of slang expressions are assigned naval/military origins, and I suppose it's always possible sailors were more in the habit of using that colourful metaphor for biting cold, but I doubt it's got anything to do with actual specific things made of brass on ships or similar.
The OED reckons it came from "Service slang", and cites 'browned off' as a comparison. The earliest use there is 1941; taken together with the Ngram, this leads me to believe it arose suddenly and untraceably, as slang does, among the troops (probably the RAF, who were very inventive in such matters), and proved so useful it spread everywhere.
"Top Brass" meant command, because of their brass insignia. "Brassed Off" might mean told off by military authority, in a slang sense.
Eric Partridge, A Dictionary of Slang and Unconventional English, fifth edition (1961) has this roundabout explanation for the origin of the phrase:
And here's Partridge's entry for part brass-rags:
It appears from these references that brass off was in use by the 1920s. The same meaning of brass off appears in Eric Partridge, [Slang To-day and Yesterday] (1935).
The "Supplement" section in Partridge's Dictionary of Slang, fifth edition, which collects all of the addenda to the first edition (of 1937), runs to almost 400 pages. It contains the following additional entries for brass off and brassed off:
However, John Ayto & John Simpson, The Oxford Dictionary of Modern Slang (1992) have a more conservative estimate of the date of origin of brassed off:
A Google Books search for the various relevant phrases produces some interesting and fairly early results. From Mary Gaunt, Moving Finger (1895):
And from George Goodenough, The Handy Man Afloat & Ashore (1901):
From Charles Gardner, First Blood for the R.A.F.: The Vlorous Story of the Advanced Air Striking Force in France (1940) [combined snippets]:
This use of brassed off certainly appears to mean "fed up" in the sense of being at one's limit to tolerate (without any sense of boredom). Two other sources source from 1941 have interpretations of their own. From John Hammerton, ABC of the RAF: Handbook for All Branches of the Air Force (1941) sees brassed off as being not merely a related term to browned off, but a diminutive of it.
From Bernard De Voto, Saturday Review (1941) [snippet view]:
So whereas Hammerton sees brassed off as a diminutive of browned off with no particular connection to boredom, De Voto regards it as an intensifier of browned off—both of which, unlike completely cheesed, he links particularly to boredom.
I find it hard to believe that brassed off in the attested World War II sense of "fed up" has no connection to brass off in the 1920s and 1930s sense of "to grumble." However, Google Books searches don't give any published examples of brass off (or brassed off) in conversational or descriptive use during the 1920s and 1930s, so the print record isn't especially helpful here.