Helps Cody Rhodes Win Insane Match

Wrestling star Cody Rhodes got a HUGE assist from T-Pain during his AEW match Wednesday -- getting a steel chair from the artist that he used to smash his opponent with!!

The wild scene all went down during Rhodes' insane "Dynamite" match with Andrade ... when Rhodes spotted Pain in the Atlanta crowd.

Rhodes -- who's buddies with the "Buy U A Drank" crooner -- went over to embrace the musical genius mid-match ... and that's when Pain handed over his steel chair to help him get an edge on Andrade.

Rhodes took the ringside furniture and proceeded to whack his opponent in the back with it -- causing Andrade to wince in pain.

Of course, it was all legal as the two wrestlers were fighting under…