Green’s Dictionary of Slang

breakfast.

1889–90		Barrère & Leland Dict. of Sl., Jargon and Cant.
1905		A. Binstead Mop Fair 70: Finding his wife giving him some anti-drink stuff in his coffee at brekker.
1911		Gem 18 Nov. 26: He’s blown steam off this morning at brekker.
1914		E. Packe diary 10 Aug. 🌐 After brekker letters arrive. Parade at 9.30 rather a sweat of a Route March.
1915		L.D. Richards diary 7 Mar. 🌐 Up at 8; a fairly decent ‘brekker’, and we shifted to Zuytpeene. [Ibid.] 16 Mar. Tuesday: Had a ripping brekker of bacon and eggs.
1923		W. Holtby Anderby Wold (1981) 144: David found himself recalling memories of brekkers in Harcourt’s rooms at the House.
1933		Eve. Post (N.Z.) 17 June 12/8: He loves lamb’s fat for brekker.
1936		Truth (Brisbane) 2 Feb. 42/1: ‘It’s a cinch, you'd have been late for breaker’.
1936		Mencken Amer. Lang. (4th edn) 568: At Oxford [the vocabulary] is made up in large part of a series of childish perversions of common and proper nouns, effected by adding -er or inserting gg. Thus, breakfast becomes brekker.
1940		M. Marples Public School Slang 69: To these [i.e. words with an -er suffix] may perhaps be added brekker (=breakfast; generally regarded as an Oxford expression) and topper ( =top-hat).
1958		Willans & Searle Complete Molesworth (1985) 250: Being late for brekker.
1965		J.P. Carstairs Concrete Kimono 9: An undesirable brekker kipper.
1988		M. Atwood Cat’s Eye (1989) 209: They call eggs eggie-poos, and breakfast brekkers.
1998		I. Welsh Filth 275: Maybe get a bit of brekker in.