Context:
Reminds me of the story of the British Lord visiting America for the first time. He was asked by an ignorant Yank if he were British. His Lordship answered:
"Why, if I were any more British you couldn't understand me at all, don'cha know."
It's just a way of writing down the pronunciation used of don't you.
Thanks
In spoken English, when a final t is followed by an initial y, the two syllables are linked together and spoken as a ch.
"Aren't you going to school today, Johnny?" sounds like: "Arn choo going..."
"Naw, I went yesterday." sounds like: "...I wen chesterday."
In the same way, a final d and an initial y make a j sound.
"Have you had your morning coffee?" sounds like: "Have you hajer morning coffee?"
"I read your report," sounds like "I rejer report."
I wouldn't say a "ch" in those cases either. I think it may be a matter that this phenomenon only happens with the word "you." (or perhaps with the "ooo" sound)
Is 'want' is pronounced something like 'watch/?