You're so skinny that if I were to put you on a flagpole, you would wave in the wind.
Skinny as a Flag
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Explanation
Explain Bear
Listen up, buttercup. The joke is about how super skinny this person is. So skinny, in fact, that if they were stuck on a flagpole, they'd flap around like a flag in the breeze. It's funny because it paints a ridiculous picture of someone being unbelievably thin. I bet you have never done a single push-up in your life.