gatling, n. — Green’s Dictionary of Slang

gatling n.

[abbr. Gatling gun, a form of machine gun, invented by Dr R.J. Gatling (1818–1903), and first used in the American Civil War (1861–5)]

(US) a gun.

1880		Amer. Punch Apr. 56/1: Is this yer a goll durned Republic where every sole kin kerry a gatlin under his cote tale an’ vote as often as he pleezes? [DA].
1893		‘One Mornin’’ J.F. Dobie Rainbow in Morning (1965) 160: Mr. Loessin got his Gatlin’ for to bring me back.
1908		S.E. White Riverman 20: Thats the first time I ever sees one lonesome sheriff gather in ten river-hogs without the aid of a gatlin’ or an ambulance!