Green’s Dictionary of Slang

(US) a derog. ref. to a Mexican/Latin person or culture.

1854		Wide West 23 July 1/2: We have gallantly drunk the health of the greaser girls, and they must now return the compliment [DA].
1874		J.G. McCoy Sketches of the Cattle Trade 375: A ‘greaser’ shepherd.
1887		Denver Graphic 29 Jan. 1/5: I saw a greaser shepherd on the Puente Hills [DA].
1889		Dead Bird (Sydney) 10 Aug. 5/1: He drew the double-cinches of a greaser saddle tight.
1900		H. Garland Eagle’s Heart 99: He made a serious social mistake when he ‘lined-up’ with the truck-farmers, [...] and the ‘greaser’ sheep-herders.
1907		S.E. White Arizona Nights 191: We went aboard and made our Greaser boatman head for Yuma.
1915		G. Bronson-Howard God’s Man 293: Don’ t tell me no [...] after all that greaser Don and his Chink said.
1920		‘Texas Cowboy and the Mexican Greaser’ in J.A. Lomax Songs of the Cattle Trail 17: A powerful feelin’ of hatred ag’in the whole Greaser race.
1931		O. Strange Law O’ The Lariat 34: Looks more like a Greaser trick to me.
1943		I. Wolfert Tucker’s People (1944) 70: He wanted to spit at the greaser bastards.
1958		Southern & Hoffenberg Candy (1970) 153: I had so much of that hot greaser dago cock.
1974		(con. late 1940s) E. Thompson Tattoo (1977) 491: He didn’t want to give her his money to pay some greaser quack.
1983		R. Price Breaks 77: I was used to his dressing like a greaser Sammy Davis Jr.
1990		S. Morgan Homeboy 234: Dan was dancing with the greaser gal with orange hair.
1993		L. Rodríguez Always Running (1996) 66: ‘You fuckin’ greaser asshole!’.