Ex-NBAer Jay Williams: I'm Un-Retiring ... To Crush MTV Star 1-On-1

Ex-NBA stud Jay Williams has found a reason to come back to basketball ... to shut the mouth of "Guy Code" star Andrew Schulz who dared to challenge the former #2 pick to a game of 1-on-1.

This all started after Schulz claimed he could "put seven points" on Williams when Jay was a guest on "The Brilliant Idiots" podcast last month ... a show Schulz co-hosts with Charlamagne Tha God.

Jay took that as a challenge ... and immediately agreed to a 1-on-1 game to 7 points for $500. In fact, Jay's so confident, HE'S SPOTTING ANDREW 6 POINTS!!

If you think it's a joke YOU'RE WRONG. This game is happening in NYC on November 1st ... and when we spoke with both men about the hoops battle ... EPIC SMACK TALK occurred.

Andrew: "He's about to to get it. I'm willing to do whatever I have to do to win. I'll yell out the name of the motorcycle he crashed while he's shooting to throw him off. Whatever I gotta do, I have nothing to lose."

"I played ball in high school, plus the dude has a drop foot. I know I can get one bucket off him. Saying I won't score one is where he f**ked up."

Jay: "I'm serious. Let's hoop for real. People think I can't play anymore. I might not be able to chase around Kyrie and Chris Paul on back to back nights, but this is easy."

"I been trying to make this happen since he first opened his mouth. He made excuses like his ankle was sore yet I'm the one that's had 13 SURGERIES. He's scared."

It's on.