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Using the twitch chat for anything constructive is guaranteed to fail. pls no coperino ravioli.

What does pls no coperino mean? I googled it and see it repeated often (pls no coperino pasterino and other variants).

I'm guessing it means copypasta (copy/paste)

Correct. It came from people copy paste spamming funny comments of others. Its kind of like a joke when you write a long chat message to say it.