You're an unfunny person if you say "That's what she said!" all the time. You're an aggressively, offensively unfunny person if you pull out your iPhone and push a button to say it.
Yes, say hello to the "That's What She Said" iPhone app. It's pretty straightforward: it's a big red button that says TWSS. When you hit it, it says, predictably, "That's What She Said." That's it. I'd say at least it's free, but really, you should get paid for using such a horrible app. [That's What She Said via The Daily What]