She is the cats mother. What is the meaning/origin off this saying?

People used to say it a lot when I was a child. If I was talking about someone and referring to them as "she" even though that person was within ear shot of the conversation. I gathered that it was rude to refer to them as "she" when they were standing right next to me, but I never understood... show more People used to say it a lot when I was a child. If I was talking about someone and referring to them as "she" even though that person was within ear shot of the conversation. I gathered that it was rude to refer to them as "she" when they were standing right next to me, but I never understood this saying and how it relates to this situation.
Update: Sorry not off, of this saying!!
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