Man, oh man! I get it that people aren't that great at spelling--spell-check has ruined us. But in addition to regret, if there's one time to make sure you've spelled something correctly, it's when you'll be putting it on your body.
. . . or putting it on somebody else's body. We're inclined to believe that saying something as simple as "hey, are you sure you want this spelled wrong" would have earned the tattoo artist a couple extra bucks as a tip.