Adrien Broner has some career advice for Conor McGregor -- don't EVER try boxing again!
We got AB at 1 OAK in L.A. ... and the superstar boxer didn't mince words when it came to the idea of Conor hoppin' back into the ring.
"If he want this work, I’ma f**k him up," Broner told TMZ Sports. "But other than that, I want him to stay away from this sh*t."
Adrien says McGregor should go back to where he belongs -- the UFC -- cause a young hitter like him would do way more damage than Floyd Mayweather.