Aaron Rodgers -- Ryan Braun (cluck) Lied To My (cluck) Face! (cluck)

Aaron Rodgers -- GB Packers quarterback and chronic bet reneger -- is blaming disgraced MLB player Ryan Braun for letting his mouth write a check his ass couldn't cash.

As you know by now ... back in February, Rodgers aggressively defended his friend Ryan Braun against allegations the Milwaukee Brewers outfielder was using PEDS ... and was so confident, he "bet" his 2013 NFL salary with a random person on Twitter.

Obviously, Rodgers was wrong and lost the bet (he'll never pay up, BTW) -- and now he's throwing Braun under the bus ... telling reporters he was merely "backing up a friend."

Rodgers says he was "shocked" when Braun admitted to cheating -- saying, "[Braun] looked me in the eye ... it didn't feel great being lied to like that."