Green’s Dictionary of Slang

a stupid or ugly looking person; also used as a derog. term of address.

1619		Fletcher Humorous Lieutenant I i: Whether would you, fish face?
1913		C. Mackenzie Sinister Street II 687: O, shut up, fish-face.
1915		S. Ford Torchy, Private Sec. 35: I’d picked out old D. K. Rutgers, the worst fish-face in the bunch.
1923		Wodehouse Inimitable Jeeves 89: He gave his verdict: ‘Fish-face’.
1934		(con. 1920s) J.T. Farrell Young Manhood in Studs Lonigan (1936) 358: ‘I’ll arrange a nice date for you,’ she said [...] ‘Yeah, I suppose with some fishface.’.
1936		‘Banjo’ Paterson Shearer’s Colt 138: Sit down, old Fishface, and lissen to me.
1941		K. Tennant Battlers 181: Better than campin’ here with old fish-face on the verandah. Pity her poor cow of a husband.
1949		R. Park Poor Man’s Orange 33: ‘Hullo, fishface,’ she chirped. ‘Hullo, pieface,’ returned Dolour unsmilingly.
1953		B. Behan Scarperer (1966) 94: Hey, fishface.
1963		J. Rechy City of Night 320: I went through fishface’s pockets first.
1986		T. Philbin Under Cover 219: And Fishface would continue to operate.
1999		Indep. 26 Sept. 27: Shove over, Fishface.
2004		R.E. Higgins Hist. of Wally Stokes 11: Just be a straight man, Fishface, feed me the lines, and watch me be funny!