Okay, it wasn't all that great ... but dude is 7'1", 324 pounds -- so give it up for him!!!

It appears the impromptu Blueface nod went down just off the set of Shaq's ultra-popular "NBA on TNT" show Monday night ... where O'Neal broke it down for a few people in the office (one of whom had a cell phone, thank god).

There was a dramatic buildup ... some hip thrusting ... and even a little butterfly dance. It was great.

There were some tense moments -- Shaq did try to drop things a little too low and seemed to tweak his groin. But don't worry, he's gonna be okay!!!

It's just the latest awesome feat that O'Neal's provided us on set ... 'memba when the 46-year-old threw down a monster dunk a couple of weeks ago?!?