This is the name (translated) of a small village in North Wales. Its main industries are slate, coal (now largely discontinued), and guys who may as well already be dead and therefore don't care about the consequences of their acts. Compare Aberystwyth.

I'm quite surprised so many people "got" that. For those still scratching their heads, look at : Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch. There's Clever.