Mickey Rourke: I'm Gonna Bash Lenny Dykstra's Face Up ON SIGHT

Mickey Rourke says he's done messing around -- and vows to bash Lenny Dykstra's face in the next time he seem him ... and he's DEAD. SERIOUS.

Remember, Rourke initially called Dykstra out after the ex-MLB star went on Howard Stern and claimed Mickey owes him $30k from back in the day ... insinuating it was drug related.

Dykstra fired back -- saying Mickey's face was an insult to the facelift industry.

Now, Rourke has apparently had enough -- and in one of the most rage-filled, angry rants we've ever seen ... the actor swears on everything he loves that he will "knock all his f***ing teeth out again."