Noun

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. the vagina. also called pink taco
   • 2007, Various, Sex & Seduction: 20 Erotic Stories, Accent Press Ltd., page 130,

     ... while grinding her pink taco into my groin as if trying to gain even more of my sizable ...

3. A yellow stain on shirt armpit caused by sweat or deodorant.