Green’s Dictionary of Slang

1. (US) a dismissal, a rejection; also attrib.

1926		J.J. Finerty Criminalese.
1931		Irwin Amer. Tramp and Und. Sl. 117: Kiss Off. – A dismissal, usually when the one dismissed has been defrauded or injured in some way.
1945		L. Hoban ‘Time to Kill’ Crack Detective Jan. 🌐 ‘How about seeing us tomorrow morning?’ Well that was quite a kiss-off, but after all he was the boss.
1957		‘Ed Lacy’ Lead With Your Left (1958) 7: What’s this add up to, the kiss-off, Mary?
1962		Ragen & Finston World’s Toughest Prison 806: kiss off – A dismissal, usually when the one dismissed has been defrauded or injured in some way.
1977		Rolling Stone 22 Sept. 77: There is nothing here as witty as his first LP’s ‘P.S. Get Lost!,’ the ultimate kiss-off.
1989		H. Rawson Dict. of Invective (1991) 226: kiss off. A rude dismissal or the act thereof.
1997		(con. 1960s) A. Frewin London Blues 234: I’ll become a non-person. Get the big kiss-off.
2003		Guardian 17 Jan. 🌐 Ipswich Town have had their fill of Finidi George. He cost them £3m from Real Mallorca just 18 months ago [...] but today, with mounting debts and the boy George milking Town for £22,000 each week, they’ve sent him packing with a £1m kiss off. Nice work if you can get it.
2011		Intelligent Life Spring 142/1: It Ain’t Me Babe, 1964. A delicate kiss-off.

2. (US) a conclusion, a farewell, a termination (usu. with sense of one party compelling it on the other).

1953		‘Curt Cannon’ ‘The Death of Me’ in I Like ’Em Tough (1958) 121: That was the kiss-off – and I decided to do the goddam job myself.
1963		Sacramento Bee (CA) 11 Aug. 26/3: The kissoff was that when the dish comes in, she’s no wow at all.
1978		(con. WWII) T. Sanchez Hollywoodland (1981) 108: If you tell me your connection, that’s the kiss-off. I’ll know you’re on the square.
1998		P. Doyle (con. late 1950s) Amaze Your Friends (2019) 81: It was the kiss-off. But [...] even that was better than most.
1998		L. Stringer Grand Central Winter (1999) 132: A pair of crisp twenties as a kiss-off.
1999		Indep. on Sun. Culture 3 Oct. 8: A kiss-off initiated by either label or band, depending on who had the upper hand.
2001		N. Barlay Hooky Gear 152: Least the henry of skunk Duane give me as a kiss-off help a bit.
2023		(con. 1962) J. Ellroy Enchanters 273: Her kiss-off note temporized: ‘Maybe, when [...] Lowell’s studies have improved’.

3. death.

1944		D. Burley Orig. Hbk of Harlem Jive 41: This is the kiss-off for / This banter.
1977		L. Heinemann Close Quarters (1987) 4: Some of the tracks had nicknames: [...] ‘White Hunter’ and ‘One Bad Cat’ and ‘The Kiss-Off’.