Green’s Dictionary of Slang

(US teen) to leave, to exit fast.

1885		Ledger (Noblesville, IN) 14 Aug. 6/2: ‘A fly copp came in and “sneezed” me. I tried to “jam”, but it was no go’.
1945		R.L. Bellem ‘Dead Don’t Dream’ in Hollywood Detective July 🌐 I jammed out of the penitentiary and there’s a law against giving any refuge to convicts.
1966		H.S. Thompson Hell’s Angels (1967) 13: Jamming crazy through traffic and ninety miles an hour down the centre stripe.
1975		J. Wambaugh Choirboys (1976) 260: I think you better jam off, baby.
1981		J. Ellroy Brown’s Requiem 119: I didn’t wait for them to finish. I jammed out of the bar.
1993		L. Rodríguez Always Running (1996) 142: ‘We is jammin’’.
1997–2000		Da Bomb 🌐 13: Gotta jam: Need to leave.
2001		(con. 1964–8) J. Ellroy Cold Six Thousand 155: They hauled. They dispersed cluster-style. They jammed down ‘J’ and ‘K’.
2004		J.A. Juarez Brotherhood of Corruption 260: My‘ lady keeps on paging me and I gotta jam’.
2023		(con. 1962) J. Ellroy Enchanters 7: They shoved her into a double-parked vehicle and jammed south.