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Deontay Wilder says he'll slap Jarrell Miller on sight for running his mouth ... telling TMZ Sports he hopes "Big Baby" has his funeral arrangements made -- 'cause he's a dead man walking!!
Miller (26-1, 22 KOs) has been calling out the former heavyweight champ for a minute ... claiming he'll whoop his ass if they ever agree to a fight.
So, when we spotted the Bronze Bomber at LAX this week ... we had to ask for his response -- and he says he doesn't need to be in a boxing ring to get his hands on the guy.