**TL;DR:** On March 13, dine in at Chipotle from 3-4 p.m. local time and show off your tattoo to qualify for a special BOGO deal. We do our best to track all the those free food deals that pop up from time to time, and the going has been pretty good recently. Dairy Queen announced the date of its Free Cone Day, Ben & Jerry's did the same, and there's a load of Pi Day deals going live this weekend. With all this competition for your business, how can the likes of Chipotle stand out from the crowd? By offering free food to anyone with a tattoo, that's how. Yes, that's right. Your tattoo can get you a special deal at Chipotle on March 13. And you don't even need a real tattoo. Visit Chipotle with any temporary tattoo or drawn-on tattoo from 3-4 p.m. local time to qualify for a BOGO deal on entrées. The BOGO promotion is limited to five free menu items per order, and each free item must be matched by a purchased item of equal or greater value.…