Can a guy explain this to me what it means?????

So, I was racing with this guy on Euclid in Anaheim tonight.  It wasn't really a race originally, I was just driving, until the guy pissed me off by cutting me off.  He wanted to race anyway, so we did.  As you all might have already guessed, I won, of course.  I successfully used other cars to block him off, and got in front of him.  The second I got in front of him, he flashed me several times.  So any guys out there can answer the question: What does the flashing mean?????  Does it mean different things if its different number, such as 1 flash is "So what?", and 2 flashes is "Screw you!", and 3 flashes is "F*** YOU *beep beep beep*"??  Can someone answer that?  Comment below, thanks.  :-)