what does it mean when someone says since moses wore short pants?

Answer 1

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It means it was a very long time ago when whatever they're talking about happened - like when Moses was a little boy who wore short pants. Early in the last century when this expression originated, boys wore knickers (short pants) until they reached early manhood - so it's just saying that the event happened long, long ago.

Answer 2

It is ageism slang, implying that Moses was young at the time of his greatest achievement, and it was many many years ago..