Green’s Dictionary of Slang

1. of a man, an act of sexual intercourse.

1841		‘Joe Buggins’ in Gentleman’s Spicey Songster 37: Says he, you bitch, you’ve been and diddled me of my put in to night.
c.1864		‘Two Cotton Balls’ in Rakish Rhymer (1917) 63: She was fairer than fitted the daughters of sin, / And just of that age when they want a put in.
1879		‘Nursery Rhymes’ in Pearl 5 Nov. 32: There was a young man of Berlin, / Whome [sic] disease had despoiled of his skin; / But he said with much pride, / ‘Though deprived of my hide, / I can still enjoy a put in.’.
1901		More Forbidden Fruit 49: ‘Come on, my girl, I must have it, I’m just wild for a put in’.

2. (US) one’s turn to speak [poker imagery].

1853

‘Mark Twain’ Hannibal Journal 25 May n.p.: Never speak when it’s not your ‘put-in’ [DA].

3. (US) one’s affair, one’s business [ext. of sense 2].

1902		W.N. Harben Abner Daniel 301: This ain’t no put-in o’ mine, gracious knows!
1938		D. Runyon ‘What, No Butler?’ in Runyon on Broadway (1954) 387: I cannot see where it is any of his put-in.
1944		D. Runyon Runyon à la Carte 2: Ambrose is always mixing himself up in murder cases, even when they are really none of his put-in.
1971		T. Thackrey Thief 191: It’s none of my put-in.