Mildorism
An attempt to pass off incorrect usage or misspelling of a word or phrase as slang unique to one's own region. Most frequently used when the two people conversing do not live in close proximity to one another.
"You're a real donkie, you know that, Taylor?"
"Donkie? You mean, 'donkey'."
"No, I mean donkie. We say it all the time in Ontario, though I wouldn't expect you to know that."
"Mm. Well, Hannah is from Ontario and she's never used it before."
"Oh yeah? Hannah is from Toronto. We only use it in Scarborough."