Is you'll also valid in the context of this video? Or is viper just setting new rules down in the English language?
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You'll is short for you will, as emily has said. Ya'll, I have heard from grammatically correct Southern friends, was a version of you, while all y'all was the form for you all (i.e. plural).
But either way, the sooner this thing dies from the English language, the better.
y'all [you all] /jɔːl/