Taco Bell is continuing its Taco Tuesday celebration by giving away free Doritos Locos Tacos. As part of the ongoing celebration, Taco Bell is giving away free Doritos Locos Tacos with no purchase necessary today. The Doritos Locos Taco features a nacho cheese-flavored taco shell filled with seasoned beef, lettuce and tomato and shredded cheese. Taco Bell will continue to give away free Doritos Locos Tacos every Tuesday until the promo ends on September 5. How many tacos can you eat at once?