Green’s Dictionary of Slang

1. Puerto Rican.

1977		E. Torres Q&A 18: I always knew you was a racist, rice-’n-beans, jive-ass Po’ Rican.
1979		E. Torres After Hours 6: Plenty rice-and-bean pistoleros here.

2. Mexican.

1988

D. Woodrell Muscle for the Wing 76: He had masterfully endeared himself to the rice-and-bean legions.