A city in NSW, Australia, north of Sydney that has a long standing rivalry with Wollongong. The steelworks there used to be the backbone of its industry.
Not much to see there now.
Person B: Why dont you go to the Gong instead?".
"Dude, New Castle is right down the road".
"It would be a quicker trip if we detoured through The Castle".
"Fuck that shit man, I'll drive the extra hour".
"Hmmm, how about Sunderland?"
"No way, that place is a shithole. I would much rather visit the better city of Newcastle."
A suprising amount of Urban Dictionary, mine too, are influenced by Viz.
accomplice: OH shit, no prob, just go to new castle!