means a Mexican dish of a folded or rolled tortilla, usually corn, wrapped around a filling such as meat, beans, cheese, or vegetables.

from From Mexican Spanish 'taco,' meaning a plug, wad, or light snack. One widely repeated story traces it to silver miners' use of 'tacos' for the paper-wrapped gunpowder charges they stuffed into rock — the tortilla rolled around filling echoing that little bundle — but this is best treated as a plausible folk tale rather than proven fact. The word surfaces in Mexico in the 19th century and crossed into English in the early 20th.