An Attractive slut, usually younger than anyone else you hang out with, around the ages of 14-16, that show up at every party, trying to get free drugs, or booze in exchange for sexual favors never leading to home plate.
Guy 1: ahh crap, that bitty is here again with her friends!
Guy 2: well this sucks, they are gonna try and take my booze dude.
A famous word used mainly in the UK in High Wycombe which originated from Herbert road an area in Micklefield. Which is used to describe a cocaine drug addict or alcoholic or a tramp.
Quote from Mr Paul the BITTY-NATOR
"a bitty is hard to explain really, some people are born a bitty or you are just a bitty and need to wake the fuck up"
"Look at that pisshead what a bitty guy."
"look at shayaan that ginja cunt what a fucking bitty"
"lets get Levvi to attack the BITTY"