Rats that live on pavement and, most commonly, streets. Like sand rats and the other variations of “rat” they are hostile if not fed goldfish and/or soda.
If you don’t pour the rest of your coke on the grounds the street rats will take you down.
Someone that isn't hood, didn't grow up in one, and/or has never seen one except in movies but adores it so much they try and mimic the lifestyle.
"Wassup, cuh?"
"Bro shut the fuck up. Fucking street rat."