The act of John Rambo embarking on what typically is known as a rampage. However, that definition only applies to everyone who is not John Rambo. If this ultimate male specimen ever decides to "rampage," the condition is then upgraded to a "Rambage."
<Dude1> Did you see that Rambage? It was sooooo much better than that other guy's rampage.
<Dude2> Dude, that's because he's Rambo. Only Rambo could do that.
Lets say you are going to Las Vegas and you begin to drink while on your way there. By the time you reach your hotel room your too drunk to even walk through the door on your own. That's a Rabago.