You don't think this sounds very similar to this? In Australia the difference is "chork" and "chock" and they have much more distinction.Oh yeah, that's a small distinction. It's more clearly defined on the Dictionary.com samples -- see here and here.
Watch the linked video in my opening post. It's not the first time I've heard it, either. "I saw that. It's the first and only time I've heard it said that way -- at least, the first I can remember.