Oscar De La Hoya Gut Punched George W. Bush ... For Real!

Oscar De La Hoya vs. George W. Bush????

It happened ... sorta ... and now, Oscar's explaining why he squared off with the ex-President and even gave him a shot to the breadbasket.

ODLH joined the guys on the "TMZ Sports" TV show (airs Wednesday night on FS1) -- and gave us the blow-by-blow from AT&T Stadium where Canelo Alvarez is set to take on Liam Smith this weekend.