I looked it up and boy is it a douchey sport. It's like freestyle working out on whatever is around while you are judged for points.

There's judging even?

ETA: There's world/international governing bodies too?

There is a world championship

How do they decide which children's playground to host it at?

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Long Chile was a silly place.

Slap fights? It seems like a sport with a ton of talk about one's kitos and heavy body odor because cavemen did not use soap and/or deodorant. I figure they get together and their high priest says, "To pick our new alpha we shall bring in the slaps. Cavemen didn't hit with a fist because they didn't know how. Carb eaters are lying to us all about the use of fists. After we all perform 30 minutes of flags their shall be slapping and he how slaps them most backwards ball caps off the most heads shall pick the playground to find the best of us all, bro"

What world?

Yes, but there's also a world championship for hide and seek, or toe wrestling. I'm not sure that's a good gauge of legitimacy.