taco ‎(plural tacos) 1  A Mexican snack food; a small tortilla with some rice, beans, cheese, diced vegetables (usually tomatoes and lettuce, as served in the United States) and salsa. ( 2 US, slang) the vulva. also called pink taco.  2007, Various, Sex & Seduction: 20 Erotic Stories, Accent Press Ltd., page 130,