Originally Posted by
1flyer
A small stab at the "armpit of America" whose inhabitants tend to come over to NYC on the weekends, get drunk, and generally misbehave?

That's certainly one interpretation
Though a milder version is that Bridge and Tunnel are simply commuters from outside the city, using bridges and tunnels for access - though without doubt the intimation of less sophisticated suburban folk creeps in
I've heard the term used in Boston, but seems there to have a more "manufactured" and much less derogatory feel to it.