The Black Country is “a loosely-defined area of the English West Midlands”; its name is apparently a reference to the color of the coal-filled local soil. Aside from coal and pollution, it is “known for its distinctive dialect,” which is the subject of a BBC story:
People that live in the Black Country are very proud of the way they speak. They have their own dialect and vocabulary as opposed to just being a different accent.
One of the most famous features is the ‘yam yam’ sound when saying certain phrases. ‘You are’ is pronounced yo’am and ‘are you’ is pronounced ‘am ya’.
Vowels are also often changed. When people greet each other they use the phrase ‘Yow awight’ meaning ‘you alright’.