It's a more emphatic, and possibly more aggressive, form of the imperative. ) It's not the standard way to form the imperative and if you use it that way, people may wonder what you're so angry about.
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AnonymousBut often I have seen(in music lyrics) like that:This was possibly the most famous one:
Don't YOU forget it.
Don't YZO do it.
TanitThis was possibly the most famous oneAnd this is probably the most common one: