"Moon Man x John Cena" is a brief splicing together of Moon Man's "Notorious KKK" and John Cena's "My Time is Now" (also remixed in Moon Man's "My Time is Now"). It is notable for being a combination of two popular youtube trolling mechanisms, namely, those two songs.
This version of "Notorious KKK" appears as track 3 on the remix compilation album Beating a Dead Nigger.
--n't my brother Why don't you go and fuck a hyena When it's dark outside I can't even--
[Cena] CENAAA!!!!! YEAHHHHH!!!!!