So, uh, without being too indiscreet: just what the heck happened here? Well, bodybuilders tend to apply tanning product with a trowel, darkening their skin in an effort to enhance definition of all those muscles that the rest of us probably don't even have. Sure, it looks fairly ridiculous, but we're not going to tell him that.
As you can see in the video below, taken at the festival, the two-tone skin look isn't unique to our unidentified competitor above.