Ice Cube: Chauncey Billups Announcement Was Premature, 'I Opened My Big Mouth'

Ice Cube is backpedaling on that whole Chauncey Billups to the Cavs thing -- saying CB is still with the BIG3 league because the NBA deal isn't officially done yet.

"Right now he with us until I hear something different," Cube tells TMZ Sports ... "Yesterday I opened my big mouth and it wasn't done yet."

Of course, Cube is referring to Billups taking a job with the Cavs front office -- the two sides are reportedly very close to striking a deal.

But until the pen hits the paper, Chauncey is still contracted to play/coach in Cube's BIG3 league -- leading the Killer 3's squad.

Cube says if/when the deal goes through with the Cavs, he'll absolutely let CB out of his BIG3 contract because the league wants to serve as a pipeline to the NBA.