A homeless person that creeps Guadeloupe St. or "the Drag" at the University of Texas. Usually they ask for money to buy alcohol or drugs and if you do not obligee, they will chase you into a store, threaten you or say something witty like thanks a lot asshole. Also, most of them have pets and they travel in packs. Ironically, the "normal" homeless people are scared of them.
Drag Rat-"Ma'am, can you please spare some change, I need some booze?!"
Student-"Sorry, I am a poor college student."
Drag Rat-"Don't be sorry, you douche bag."