Doesn't exactly have to be a "kid" thing either, as the trendy things that teenagers do also apply.
"Hey, what did you do to your hair?"
"Instead of a weave I had my mom place yarn instead. Isn't it cool?"
"That is some Heely-kid shit. Fuck you."
Non-Heeler : In Heelys? Yeah right, Heelys can't do anything cool!
Heeler : ... Yes ... they ... can!
*does an awesome frontside tru*
Non-Heeler : WHOA! THAT WAS SICK!
Heeler : Smart choice!