Green’s Dictionary of Slang

(a) (US) an Automat [the coin-operated self-service Automats, popularized in New York (although in no other city) by the Horn & Hardart Baking Co.].

1993

(con. late 19C) I.L. Allen City in Sl. (1995) 100: The Automats were sometimes called slots.

(b) (orig. US black) a general term of address [Mezzrow & Wolfe, Really the Blues (1946): ‘A private inner-racial joke, suggesting a mouth as big and as avaricious as the coin slot in a vending machine, always looking for something to put in it.’].

1946

Mezzrow & Wolfe Really the Blues 216: Got to do it, slot.

(c) (orig. US) a slot-machine; often in pl. as the slots referring to an arcade.

1961		J. Scarne Complete Guide to Gambling.
1962		S. Longstreet Flesh Peddlers (1964) 270: ‘What’s so special about slots?’ ‘The one-armed bandit is a dilly.’.
1968		T. Thackrey Gambling Secrets of Nick The Greek 173: The people you find hanging around playing the slots [...] are not smart enough to do any really effective tampering.
1996		R. Doyle Woman Who Walked Into Doors 152: We played the slots – we were the only ones in the arcade.
2000		M. Amis Experience 339: Past the pubs and offies and slot-arcades beneath the Westway.
2002		J. Franzen Corrections 298: The Strindberg Room was packed with kibitzers, low-stakes blackjack players, and lovers of the slot.
2020		S.A. Crosby Blacktop Wasteland 74: We don’t go to Atlantic City as a group and hit the slots‘’.

(a) (also loveslot) the vagina.

1890–1904		Farmer & Henley Sl. and Its Analogues.
c.1900		Confessions of Lady Beatrice 44: The curls of her slit, her loveslot, honeypot, were framed by the white linen.
a.1934		‘Bonnie Parker in “Amputated”’ [comic strip] in B. Adelman Tijuana Bibles (1997) 115: Come on – drop it in the slot.
c.1940		‘Etta Kett in “Endorsed”’ [comic strip] in B. Adelman Tijuana Bibles (1997) 36: Now the old boy’s in the slot.
1966		Trimble 5000 Adult Sex Words and Phrases.
1972		B. Rodgers Queens’ Vernacular.
1980		Maledicta IV:2 (Winter) 182: The simplest words in common use for this ‘nasty thing’ [...] are those accepting the female sexual apparatus as a simple receptacle. These include [...] slit, slot.

(b) (US gay) the anus.

1963		in T.I. Rubin Sweet Daddy 80: I don’t want your god-damned tissues [...] Wipe your slot with them.
1972		B. Rodgers Queens’ Vernacular.