Jay Z's Pep Talk To Dez Bryant Proves Ineffective In Loss To Giants

Jay Z might wanna stick to pumping up athletes through his music, 'cause his in-person pep talks don't seem to be as effective ... just ask Dez Bryant.

Prior to Bryant's game against the Giants, Hov took a second to hype his Roc Nation athlete for Sunday Night Football ... which sounds like a great idea, right?

Only problem is, Bryant was held to just 1 catch for 10 yards the whole night ... AND he fumbled the only catch he had.