Photo: Getty Images

Retired NBA player-turned-TNT analyst Charles Barkley better keep his head on a swivel – the Los Angeles Lakers legend Shaquille O’Neal says he’ll follow Will Smith’s lead and slap the hell outta his TNT co-host … dropping the playful threat in a hilarious freestyle rap.

The Big Aristotle made the comment at his surprise belated birthday party at Steak Market in Atlanta on Wednesday … when the crowd of about 250 people asked him to get up to the DJ booth and give them a set: