Green’s Dictionary of Slang

(orig. US) to leave quickly, to run off.

1931		Dly News (Middlesbro, KY) 26 Sept. 2/1: The command to ‘scram’ or ‘amscray’ means to leave immediately or disappear from the sight of whoever is approaching.
1934		Weseen Dict. Amer. Sl. 17 3: [College Slang] Amscra — To depart.
c.1935		‘Mae West in “The Hip Flipper”’ [comic strip] in B. Adelman Tijuana Bibles (1997) 95: Schnozzle was given the office to amscray.
1941		Lum and Abner 28 Oct. [radio script] Amscray on the porchola [W&F].
1945		Yorks. Post 30 July 1/6: ‘Amscray’ [...] appears to be American baseball slang.
1953		Mad mag. Apr.–May 7: Amscray! Agitate the gravel! Hit the road! Strike the pavement!
1954		Mad mag. Aug. 31: Scat! Scat! Amscram!
1956		‘Vin Packer’ Young and Violent 55: So you am-scray, Nothin’ Brown. Leave Gobe be.
1974		(con. 1945) E. Thompson Tattoo (1977) 382: Scram! Amscray!
1990		(con. early 1950s) J. Ellroy L.A. Confidential 366: So amscray and come back for lunch sometime, say on the twelfth of never.
2001		‘Randy Everhard’ Tattoo of a Naked Lady 179: Take a powder [...] Take a hike [...] Am-scray.
2005		My Life as a Wheeldog [blog] 6 May 🌐 They liesurely [sic] grazed on the bushes for about ten minutes until something told them to amscray.
2006		Wikipedia 🌐 amscray Pig Latin version of scram; possibly the only Pig Latin phrase to enter common English besides ixnay.
2013		T. Pluck ‘Six Feet Under God’ in Life During Wartime (2018) 190: ‘Amscray, shamus’.
2021		J. Ellroy Widespread Panic 51: He amscrayed to score some Big ‘H’.