Rikishi -- Calls Out Kim Kardashian ... YOU GOT NOTHIN' ON MY HUGE ASS!!!

They have two of the most GIGANTIC asses on earth ... but former WWE star Rikishi says he wants to end the speculation and finally challenge Kim Kardashian to an official BOOTY CONTEST!The 49-year-old was at the Miracle on 1st Street toy giveaway at…

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