Those kids in their econoboxes think their car is fast cause it's all they've ever had. What's funnier is they think it's even faster when they fill it full of their buddies! Even if they can still go fast in a striaght line, they fall right off the turns and kill each other in droves.
Anyway, that rocker symbol (pinky and index finger pointing straight up, thumb out to the side) is the ASL sign for "I love you." (I = pinky straight up, L = index straight up, thumb pointing out to the side [like the letter L], and Y = the pinky straight up and the thumb pointing out to the side. Nice short-hand, so to speak.)

The rockers are telling the band they love them when they use the rocker symbol, not giving them the evil eye.
Maybe that's why they go crazy. They think you love them.
An alternative sign is the pinky straight up and the thumb out, and rocking back and forth. That is ASL short hand for "me and you" as in the letter I and Y above, but the thumb pointing towards the signer (with the pinky up and no thumb this is the first person singular "I") and the pinky pointing towards the object of affection with the thumb out (short hand for the second person singular "you"). The rocking motion connotes "me and you... baby.")
The italian evil eye symbol is the pinky straight up and the index finger straight up, no thumb.