Charlamange Tha God -- Co-Host Enlists NBA Help ... To Punish Jay Williams

Jay Williams might be in some trouble ... cause "Guy Code" star Andrew Schulz says he's got a secret weapon to defeat the ex-NBA player in their 1-on-1 game ... a CURRENT NBA player.

Andrew and his "Brilliant Idiots" co-host Charlamagne Tha God were out in NYC when we had to ask about the big game he has coming up with the former NBA stud on Sunday.

Schulz only has to score once to beat Jay -- which Charlamagne thinks won't happen -- but Andrew says he's supremely confident 'cause of a little advice from one of Jay's old college rivals ... Pistons guard Steve Blake.

Andrew says Blake can give him the blueprint to stopping Williams ... from the days when Steve's Maryland team used to battle it out with Williams' Duke squad in college.

Check out the clip -- Andrew is the very definition of doubling down ... once again reiterating that Williams is too old, too hurt, and too mentally fragile to keep him from scoring.