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Kids are often like recorders with replay buttons that you have no control over. They don't need to understand what they've recorded and replay.
My BIL and I, along with a couple of our friends, have gotten his 8 year old son into the habit of saying, "That's what she said." It wasn't entirely intentional, it's just something we say to each other often.
The vast majority of the time he doesn't say it at... let's say an appropriately inappropriate time, but every once in a while he nails it, and we find it hysterical. He has no idea why it's so funny, but he likes the attention nonetheless. I'm just waiting for the day he gets in trouble at school. My sister is, needless to say, rather annoyed with all of us.
My kid is nearly twelve and has gotten that from somewhere (Youtube?) -- though of course I use it too.
As luck would have it, a few weeks ago the tech writer lady at work advised me that I hadn't given her enough documentation to include in the overall project documentation -- but she worded it as "you didn't give me enough meat". You can imagine the first thing that popped into my head, but I resisted, and instead replied "I've heard that before".