Jorge Posada -- Umpires Used to Fart On Me ... 'But I Returned the Favor'

When you're an MLB catcher ... there are serious hazards of the job.

Being farted on by the home plate umpire is apparently one of those hazards ... so says former Yankees superstar Jorge Posada.

Don't worry, Jorge tells us if an ump hit him with a stink bomb -- he always got even ... "I returned the favor."