Why do people say "not to mention" when they are talking?

Question

and then they mention it anyway, what does that phrase mean anyway.

Answer 1

Its short for don't mention what your saying in context with .that's OK. its not necessary to thank me, or say anything, its Short for what they mean in there manner of expression of what there saying.you have to understand what there saying it in in context.in other words, they wont to have control of the conversation.

Answer 2

I am a victim of this one time and time again. I think it means not to be overlooked????