Michael Jordan is an absolute CHEAPSKATE ... so says his BFF Charles Barkley who claims MJ is so chintzy, he actually SLAPS Barkley when he tries to give money to homeless people.
Sir Charles appeared on "Conan" last night and spilled all the dirt on his pals -- saying," There's nobody cheaper than Scottie Pippen and Michael Jordan ... he's cheap."
"I always give homeless people money and [MJ will] always slap my hand and says, 'If they can ask you for spare change they can say 'Welcome to McDonalds, can I help you please?'"
Barkley says he's the exact opposite -- and believes VERY strongly in tipping huge ... "The more successful you are, the more you should tip. I truly believe that."
In fact, Barkley says he once tipped a blackjack dealer $25k ... and feels bad that he didn't give more.
Barkley says there's one more famous cheapskate who's up in the Pantheon of all-time tightwads ... check out the clip to find out who.