Sideways Taco Share definition Flag A term for a vagina with large, flapping labia majora. Mios Dios! That sideways taco is enough to feed all the king's horses and all the king's men! Sideways Taco by Slick Dick Lick/Gerber Baby June 18, 2004 0 0 Get merch Get the Sideways Taco mug. Buy Now — $32.95 See more merch