" It appears to be a mistake (or certaintly a variation that I don't recognise as idiomatic) for "Don't get too upset with me". Later thought: Sorry, it may not mean that. It may be intended to mean "Don't get too upset (about something else mentioned in the context)", with "on me" meaning "in a way that affects the situation we're in", or something like that.
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upee543Don't get too upset on me?"It appears to be a mistake (or certaintly a variation that I don't recognise as idiomatic) for "Don't get too upset with me".