According to Chewboom, Taco Tuesday is back and you could score a free Taco from Taco Bell! The chain is giving away free Doritos Locos Tacos on August 15- no purchase necessary! All you have to do is go by a participating Taco Bell location to get your own Doritos Locos Taco. Taco Bell will continue the giveaway each Tuesday until September 5. The Doritos Locos Taco features a nacho cheese-flavored taco shell filled with seasoned beef, lettuce and tomato and shredded cheese!