It's a strange cameo to say the least.
John Wall made a cameo in a Disney XD show and I don't really know what to make of it. He does, however, cross over and dunk on a little kid before hitting us with a smooth Nae Nae.
Without knowing any context in terms of the show's plots or characters, it seems Wall is interacting with a spiritual/magician type who wants badly to dunk on someone. It's not exactly Space Jam quality but hey, not much is.