Deadbeats

"Get the hell off me, you fricking deadbeat psycho!
What did you called me, sinner? (Gets his axe already)
Oh crap... (Starts to run)
Get the hell away from me, you freakin' psycho!
Come back here, you sinning mothersexer!"

— Earnie and Adam

Kids whose age is from 15 to 18, but they don't go in school, instead they run in a gang, and/or use drugs or sell the dope.

Or simply, druggies, whose parents may be still alive. A good example of that is Leonardo Da Vinci.