A friend forwarded this link to me for an article about a new use for the word 'yo.' After reading it I wondered whether this new usage would be considered polysemous to the previous 'accepted' usages, or if it's tantamount to creating an entirely new meaning for the word or creating a homonym. Its previous usage has been either as an interjection or, as I have heard and used it, as pronoun of a sort used in places where 'dude' and 'man' have been used.
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