Diddy and his entourage rang up a $200 tab at a NYC bar during the Super Bowl ... then STIFFED their waitress on the tip ... according to the bar which is now publicly shaming the multi-millionaire.
Employees say on Sunday Sean Combs and his friends were at The Bar located in the Dream Hotel ... and when the bar manager asked Diddy if he was receiving good service ... Diddy said everything was A-ok.
But when it came time to pay ... staffers say Diddy left a giant goose egg for gratuity.
Now The Bar is calling him out ... ridiculing him on its Facebook page -- "Although [Diddy's] Net worth is in the millions, he felt it necessary to stiff a hard working young girl for $40 bucks. What a gentleman....!!!"
Of course it's possible Diddy thought, for once, someone else in his entourage would pick up the tab. We've reached out to him ... so far no response.