its being fed up because you've waited 10 minutes too
long in a left turning
lane that just doesn't seem to be moving, and finally after minutes of considering your options, deciding to
jump into the unoccupied adjacent
lane, riding it through and at the very end of it
cutting a hard left and consequently cutting off the person who had been waiting patiently for his oppurtunity to take his left turn... but you were the one who courageously, steathily, cleverly bypassed a 30+ minute wait. and lastly its about celebrating by pumping your fist over and over and over again while screaming "yeah... did u see what i did? did you see what i just did?" to your stunned passengers.