Question 1) what is the hair cut:
normal hair
http://www.dragonballmaster.com/Specials/Trunks/18.jpg
dragon ball z hair
http://www.dragonballmaster.com/Specials/Trunks/17.jpg
question 2) where do they come from:
they come from everywhere. They are simply preppy italian kids with bad hair styles.
question 3) what is their purpose:
when I figure that out I'll let you know.
question 4) New age guido?:
yes