a) One of the DUMBEST sexual-based jokes.
b) A joke used to make anything sound sexual.
She, being the imaginary girl he *supposedly* had "it" with.
She said, meaning what she said during the process of his *imaginary* sexual intercourse.
Ex:
Teacher: Bob, give it to me, it's mine!
Boy: That's what she said!
Ex 2:
Boy 1: Ew man! Look, I got it all over me!
Boy 2: Woah dude, you're gonna have to rub this all over it!
Boy 3: THAT'S WHAT SHE SAID!
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