I feel like this had to stem from a combination of a lost bet and verbal misunderstanding, I'm guessing the guy was partying and thought if he didn't down the whole 6-pack in 60 seconds he was just gonna have to "tack up some drywall." But nope. He sobered up and his friends held him to it, "no dude, we said TAT your EYEBALL. And that's it. No backsies!"
On second thought, the guy's name is listed in the article as "Pauly Unstoppable"(!). And in addition to the must-have Blue Eye he looks like he was out tanning with Wonder Woman's belt strapped around his forehead. So he's probably just an
Also, see what Canada's health care system gives them the freedom to do? Hail Canada!
World's First Eyeball Tattoo [The Sun]