I was raised in south jersey, about 30m from Philly, and I remember exactly when jawn hit our little town, right around Y2K. I was in 9th grade at the time, and I remember it being like an arms race where people were throwing jawns out at every little thing, regardless of necessity. I also remember it pissed off a couple of the "cool kids" who were actively trying to coin "gwat" with the other students. It had some legs at first, but jawn came along and everyone forgot gwat.