"rifraf street rat I dont buy that if only they'd look closer would they see a poor boy no sir-e they'd find out there's so much more to me."
Street rats are generally on their own and feel at home anywhere in a given city. The alleys, buildings, dumpsters are their domain.
Not to be confused with Hood Rat, rat fink, rat pack, or a group of homeless kids generally defined as a wolf pack.
Hence the name of the main real life character in the homeless youth documentary "street wise".
Also referenced to in the song by hardcore band Sick of it all - "Rat Pack" or the crust band the Virus with the song "Rats in the City"
Yeh Yeh wot ya gonna do street rat