Green’s Dictionary of Slang

Fritz adj.

also Fritzie
[Fritz n.]

German.

[US] in Peat & Smith Legion Airs (1932) [song title] Keep Your Head Down ‘Fritzie’ Boy’.
[UK]F. Dunham diary 31 Oct. Long Carry (1970) 124: Our Company Stretcher Bearers had a roomy Fritz dugout.
[UK]C. Hamilton William – An Englishman (1999) 218: He gathered from the sharp-sighted corporal that there were two Fritz planes overhead.
[US](con. WWI) H. Odum Wings on My Feet 249: Talk ’bout coloured worker bein’ lazy, ought to seen them Fritzie boys.
[Aus]Western Mail (Perth) 30 Nov. 2/1: Mr Snow comes on like a Fritzie barrage.
[US]F.X. Toole Rope Burns 42: Could have knocked Tarzan out in three rounds, but Reggie want respect, so he punish that Fritzie boy.