Parrygib?
 

I couldn't find a specific thread concerning this, but I know that if you are parried while tanking, then a boss gets a free hit on you. But what if you are tanking and a melee is DPSing from the front and get parried, will the boss then get a free hit on me(the tank) also?

Sorry if this has been posted but I searched and couldn't find it.

Yes. the parrylol mechanic applies regardless of who gets the mob to parry. Even Hunters pets. It was probably one of the reasons behind adding the "go behind the mob" behaviour to the pet AI.