Welcome to the Dozens ... starring Barack Obama?!?

He's got jokes! Fat jokes. Gambling jokes. Shaq jokes!! Plus, actual information about the COVID vaccine (no joke!)!!

Obama sat down virtually with Charles Barkley and Shaquille O'Neal as part of ATTN:'s "Roll Up Your Sleeves" special on NBC ... where the goal was to educate the public about some of the misconceptions about the vaccine.

But, before he got down to business ... Obama had a little fun at Shaq and Barkley's expense!