Green’s Dictionary of Slang

(US) go away!

1865		in B.L. Ridley Battles and Sketches of the Army of Tennessee (1906) 461: Wheel into line! By turn around! Git!
1876		Besant & Rice Golden Butterfly III 53: But git. Git at once.
1890		Bulletin (Sydney) 19 July 18/1: ‘And what are ye come here fur?’ / ‘To git.’ / ‘Well, git then, and leave me alone.’ / ‘But the boss told me to find you and start work.’.
1897		Eve. Times (Wash., DC) 2 Nov. 2/7: ‘What does “git” mean, bishop?’ ‘Why, “git” is American for “get” and means “go away” ’.
1907		C.E. Mulford Bar-20 xi: Now git! An’ if I sees yu when I leaves I’ll send yu after yore friend.
1918		Boy’s Own Paper XL 5 236: Off with you! [...] Git!
1934		E. Caldwell Tobacco Road (1958) 140: But durned if I can’t run you off it – now git!
1944		J. Cary Horse’s Mouth (1948) 49: ‘Git.’ And I shoved him out and banged the door.
1955		‘Blackie’ Audett Rap Sheet 191: You’re not in here to nurse a belly-ache. Git!
1962		T. Berger Reinhart in Love (1963) 43: Sure, it’s only my cancer. Now git!
1970		D. Mitchell Thumb Tripping (1971) 23: I’ll see you around. Git.
1987		B. Chatwin Songlines 80: ‘Git, yer bastard!’ He raised his fist and the cat flew off.
2001		(con. 1975–6) E. Little Steel Toes 146: Phil takes a step [...] and roars ‘Git!’ And git they do, three cheap suits running back into the bank in tight formation.