Did you ever flip someone off whilst driving?

No. My specialty was Mooning. ;)

too many times!!!
I try to keep it in check though
Some people will turn around and shoot you
for flipping them out...haha

I used to, but these days, you don't know if that person will come after you, so I don't bother anymore. 

Yes, I have, multiple times. I've only done it when someone's done something dangerous (that also pisses me off). 

I have never flipped anyone off, whether driving or not. (I've thought about it, though).

I used to be really bad about that and cussing at them too until some guy was ready to follow me down a dead end street and I had no place to go.
He didn't because I had my brother in the car with me.
I stopped doing it after that. Now I just cuss under my breath. 

No.

It is much more satisfying to hunt them down and kill them.

No, I've shaken my fist at someone who cut me off though. They thought it was funny and laughed then I started laughing too.

I don't do vulgar hand gestures.  So, no.