Green’s Dictionary of Slang

1. (US) the hand, in phr. put her there, an invitation to shake hands.

1915

T. McNamara Us Boys 15 Jan. [synd. cartoon strip] Put ’er there kid!

2. (also herself) one’s wife.

1936		T. O’Reilly Tiger of the Legion 29: I looked across at where my mother had been lying. She had gone [...] ‘Herself is all right!’ [my father] reassured me .
1950		S. Murphy Stone Mad (1966) 184: Herself is always in a good humour of Friday evening. [...] Why, man, she’s like a cat with kittens until I fork out the wages.
1995		S. Moore In The Cut 98: I have new words for the dictionary. [...] her, she, wife.

3. (drugs) cocaine [girl n.² (1)].

1969		R.R. Lingeman Drugs from A to Z (1970).
1971		E.E. Landy Underground Dict. (1972).
2001		ONDCP Street Terms 11: Her — Cocaine.