Green’s Dictionary of Slang

(US) a derog. term for a Mexican.

a.1946		‘The Open Book’ in G. Logsdon Whorehouse Bells Were Ringing (1995) 117: But now that I’ve opened the ledger / On the romantic braggarts who ride, / Some frijole chomper or locoed bronc stomper, / will be after my scalp or my hide.
1983		Maledicta VII 24: The bean theme for Mexicans has been variegated to bean, beaner, beano,and frijole guzzler.
a.1985		‘The Open Book’ in G. Logsdon Whorehouse Bells Were Ringing (1995) 113: Some frijole chomper or half-assed bronc stomper / will kick all the shit out of me.
1989		H. Rawson Dict. of Invective (1991) 229: frijole eater, a Mexican.