I was playing Warcraft. I clicked on my peon.
He told me: "me busy. leave me alone."
Why is it OK to say it that way instead of just "I'm busy."?
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It's wrong. This is deliberate on the part of the game designers. Peons are not known for being highly educated or well-spoken.
However, babies sometimes speak this way before they learn the difference between objective pronouns (me) and subjective pronouns (I). For that reason, incorrect constructions like "me (verb)" or "me (adjective)" are associated with "baby talk."
Imagine a man who was raised in the jungle by animals ever since he was a child. He was not taught English since animals don't speak English. He has only recently met his first human, and is currently being exposed to speaking English (or any civilised language, for that matter) Which statement would make more sense to come from him, in this context:
Your question seems to assume that Tarzan should have a grammatical (and thus educational) level equivalent to that of either the reader or the person he is speaking to - but Tarzan is inherently defined as a character who is lacking any education. It makes sense for him to not have a good handle on grammar. It literally defines his character and the entire narrative - a man who is learning about civilization for the first time.
Peons, by their very nature of being a peon, lack the same grammatical skill that Tarzan does. They are defined by their lack of refinement. Their statements specifically reveal that these are not highly trained individuals.
"Me busy" is not standard English. It's an example of "caveman speak", which is a form of English used in fiction when depicting characters who are capable of speech, but who are very stupid, brutish or "primitive".
Your character in Warcraft is probably an orc or some species like that. The game has your character speaking in "caveman speak" in order to show that he is unintelligent.
I don't know of any real-world varieties of English that are similar to "caveman speak". In my experience, it's not similar to the speech of children, non-native speakers, or people with language disabilities.