Backup Browns quarterback Johnny Manziel was front row and center to root on fellow Ohio sports star/BFF LeBron James in his homecoming debut as a Cleveland Cavalier Thursday night.

And the quarterback was not shy about showing his support for the Cavs during their home opener against the New York Knicks.

He and his buddies (including Usher and Browns cornerback Joe Haden) started out the game all smiles. But after what appeared to be a call that went against the Cavaliers, Johnny Mad-ziel went on an expletive-filled tirade, dropping F-bombs, removing his hat in frustration and angrily cussing out the referees on the court.

Check out the NSFW clip below (warning: bad language ahead):

To add injury to insult, LeBron and Cleveland lost their opener against the Knicks, 95-90.

H/t TMZ Sports