When we go to other country and we have troubles with car-drivers, motorbike-drivers, pedestrians, or even others bikers, and we need express our displeasure, we need say the correct bad word.
So why don´t we help each other saying that words.
For example if you have a problem in Argentina the best word to use is "pelotudo" (pe-lo-too-dho) with the accent in "-too-".
If the person is near you is convenient say it in low voice, if you are at a good distance you can say it shouting.
When the other person say something to you can say "andá a la mierda" (an-da-ah-la-me-ehr-da)
Now, tell me, what do you say in your country?