Dumpster Teen / Teenager

Dumpster teens/teenagers are teenagers who have been disowned or they have run from home (for any reason) and live on the streets. Usually they are known to be troublesome (stereotypically)

A dumpster teen / teenager means in speech:

“Why do those bunch of teenagers look like they’re homeless?”
“Ah, pretty sure that’s because they’re dumpster teens. Lots of trouble, those ones.”

OR in a non-speech text sentence:

The dumpster teenager groaned as she checked her phone, realising it was dead and that with her charger broken, gaining a new one would be close to impossible.