A street person or person of the street. These people usually dwell in cars that aren't theirs, warehouses, squatting holes, gutters, garbage cans, boxes, parks, opium dens, public bathrooms (bus/train station, airport), bushes, soup kitchen's, etc.
They can often be seen swimming in yuppie's pools in the daytime while the sell-outs are at work and carrying a bottle shaped brown paper bag.
Yuppie: get out of my way you bum!
Urchin: *pulls out urchin/hobo knife* I'm no bum, i'm an urchin! *stabs yuppie and steal his wallet for booze*
Urchin: *whistles tune* I love to live the urchin life, stabbin people with my urchin knife
A person who's an asshole and doesn't seem to get that you don't want to talk to them. Has a tendency of being very annoying. Also dresses very trashy and can be depressive.
Scene: You and your friends are standing around having
a nice chat about something when the urchin comes along unexpectedly.
Urchin: Hey losers *BLAHBLAHBLAH*
*sticks around and disagrees with everything you say*
Bill O' Reilly's synonym for a soc-med brain-numbed bratager
Bill O'Reilly of Fox News: Warning to all liberal parents, dear parents, please take your urchin away from the machine, or the machine away from the urchin, i don't care, and let them read some of my education books.