How would you define "road rage"?

What excatly defines road rage? I was on changing lanes to get into the turn lane to get on the highway today and put my blinker on to get over and although the person in the other lae was giving me room to come over, he was speeding up (sort of like he was barely giving me enough room to get over). I waved as a gesture to say thanks anyhow. When I did get over and got onto the highway there was a pile up of cars in my lane and when i signaled to change into another lane the same person sped up really fast to the point that I had to swerve back into the lane to avoid him hitting me. I flipped um the bird, I mean that was ignorant.

Anyway, when I finally did get over and I passed him he looked over at us and was screaming and we just laughed and waved. I figured "Got ya really far to cut me off didn't it?"

Is flipping the bird really road rage or is what he did by cutting me off to keep me from geting in the other lane considered road rage? Or are the both road rage?

Just curious about everyone's opinion and how youw would have handled the situation. LOL