Forget The Big Shaqtus ... just call him Shaqiana now -- 'cause Shaquille O'Neal hit the Bust Down dance -- and kinda crushed it!!
OK, 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 .