cacas Share definition Flag One who is extremely tan or brown, usually a Mexican-American who is just more brown than the others. Derived from the spanish word "caca" which literally means shit. Dude look at cacas run, he's just a big brown blur. cacas by Sandman March 4, 2005 0 0 Get merch Get the cacas mug. Buy Now — $32.95 See more merch