Chris Johnson Clowns Tom Brady After Titans Win, 'Might As Well Retire!'

"Brady might as well retire!!!"

That's Tennessee Titans legend Chris Johnson gloating his face off after his squad beat the Patriots ... with CJ2K advising TB12 to hang it up for good!

Johnson -- who spent 6 seasons with the Titans back in the day -- was a VIP guest with the team at Gillette Stadium on Saturday night. And, when the team came out with the W in the Wild Card round, Chris got right in the middle of the action!

"I told you we was gonna smack this sh*t, man," Johnson shouted after the 20 to 13 victory ... "I already knew it!"

"We told 'em we was gonna get that sh*t!!!"

The bragging and the smack talk continued outside the locker room ...

"Brady might as well retire! We done painted that sh*t!"

Watch the video, Johnson is convinced we've all seen the last of Brady on the Patriots -- and maybe forever!

For his part, 42-year-old Brady didn't sound ready to retire in his post-game press conference ... telling reporters it's "hopefully unlikely" he quits pro football for good.

"I love the Patriots. It's the greatest organization," Brady said.

"Playing for Mr. [Robert] Kraft all these years, and for Coach Belichick, there's nobody who's had a better career, I would say, than me -- just being with them. So, I'm very blessed."