Floyd Mayweather is spitting more venom at Dana White -- calling him a "small boss" who used to carry his bags back in the day.
Mayweather went off on the UFC honcho at the Barclays Center this weekend -- once again trashing Dana's $25 MILLION offer to fight Conor McGregor ... this time, he took a stroll down memory lane.
"Dana White ... he was a player. He was a boss ... but he was a small boss."
"I can remember Dana White used to hang around me and Jeff Mayweather and carry my bags.