That's What She Said Meaning

Example : 2008, Ron Fletcher, "In the Internet Age, a few lessons about bad jokes, good taste," Boston Globe, 2 Mar. (retrieved 7 Apr. 2009):  Some seemed bored and irritated by the priapic yahooism and overwillingness of peers to read a sexual double entendre into the most innocuous remark. "No matter what you say," said one student, "someone is going to respond with ‘That's what she said.’ "2008, Rick Broida, "Quick Tip: Increase the Font Size in Your Browser," PCWorld.com, 24 Nov. (retrieved 7 Apr. 2009):  So this morning we pulled up a pumpkin-pancake recipe on the kitchen laptop. Just one problem: My wife couldn't read it from where she was mixing. "Can't you make it bigger?" she asked. (Go ahead, insert your own "that's what she said" joke here. No class.)