Green’s Dictionary of Slang

a verbal style, orig. in services, affected in 1950s by society and formerly widespread although now mainly obs., in which various words are prefixed by Harry and suffixed by -ers, e.g. Harry flakers, tired out; Harry crashers, asleep etc.

1945		D. Bolster Roll On My Twelve 128: We’ve dropped the old hook, it’s good old Harry flatters and a make-and-mend.
1959		A. Sinclair Breaking of Bumbo (1961) 84: Well, well, who’d have thought it? Hetero Bumbo is off with the harry homos.
1959		G. Slatter Gun in My Hand 152: Some of them will be really ubriaco when they stagger out that door. Harry Flakers as the Navy would say.
1966		M. Allingham Cargo of Eagles [ebook] Get me a Harry pinkers — a large one .
1978		Maledicta II:1+2 (Summer/Winter) 119: Brahms can also mean ‘urinated’ as well as ‘drunk’ (pissed as a newt or harry flakers, which is ‘half drunk’).
1980		T. McClenaghan Submariners II ii: God, it’s harry hotters in that engine room.