Linguistics
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That said I feel like when people are referring to whether or not something "is a word" they're referring to whether not is has seen historical/widespread usage, not "has somebody ever just decided it meant something, somewhere, at some point"
most often it's said to dismiss people. AAVE gets a lot of that. but it's used to mock and dismiss young people too by the "back in my day" crew.
I know who AvE is; who's AAVE?
African American Vernacular English... what's AvE?
AvE is a YouTuber.