Legendary boxing promoter Bob Arum took out his metaphorical newspaper, unbuckled his metaphorical pants ... and took a big steamy metaphorical crap all over the Mayweather, McGregor fight.
"It's not a fight for Christ's sake," Arum told TMZ Sports ... "There's not even a chance McGregor wins."
Arum says he's not shocked at reports saying tickets to the fight haven't sold out yet -- telling us, "There's a limited number of suckers."
No surprise he hates this fight, Arum and Dana White have been at war for years.
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