Where did the saying "your mom" come from? What does "that's what she said" supposed to mean?

Question

Where did the saying "your mom" come from? What does "that's what she said" supposed to mean?

Answer 1

I'll tackle the "that's what she said" part of your question. You have to have a certain level of sophistication to understand the joke. It is used when someone says something that could be interpreted in a different way, also called a 'double entendre' That person usually did not realize that until he said it, the other person replies with, "that's what she said" , everyone sees the other meaning.