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Hi ArcticBoy, welcome to the discussion!
Assimilating foreign words and expressions into a language is a sign that this language is alive, but it's not creating a new language, although after several centuries of this the language may look very different.
We have a lot of slang words in French that come from the Algerian (which, from what I understand, is itself a language that bears the trace of many different influences, among which the original native languages (still living today as khabyle), arabic, French, and probably many others. Languages continuously reinvent themselves, and slang is often the most creative and lively part.
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