Green’s Dictionary of Slang

mandozy n.

[the Anglo-Jewish prize-fighter Daniel Mendoza (1764–1836)]

1. a powerful blow.

1984

Partridge DSUE (8th edn) 720/2: ca. 1800–70.

2. a term of endearment among London Jews.

1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict.