Green’s Dictionary of Slang

nammo n.

a woman.

1859		Hotten Dict. of Modern Sl. etc. 128: NAMOW, a woman; dillo namow, an old woman.
1861		(con. 1840s–50s) H. Mayhew London Labour and London Poor I 33/2: The older ones may talk about their sweethearts; but they always speak of them by the name of ‘nammow’ (girls).
1873		Sl. Dict.
1923		Northern Whig 12 Sept. 8/6: In some parts of the East End of London the coster class [still] say ‘occabot,’ [and] ‘reeb.’ A boy is still a ‘yob,’ a woman a ‘namow,’ and a girl an ‘elrig’.
1977		D. Powis Signs of Crime 194: Nemmo Woman (London backslang).
2001		J. Burkardt ‘Back Sl.’ Wordplay 🌐 nammo: woman. namoh: woman.