I was expecting the accent to be mostly nonsense, but there's actually a lot of interesting history here! I don't think it will do much to alleviate the in-group cringe I feel when I hear people using it though. Then again, I'm remembering a time when I tried to order a "plain pie" at a pizza place in Portland, OR and the woman behind the counter just stared at me totally confused. Even without the accent there's definitely some lingering linguistic oddities.