You're so skinny, when you did your first jump on a pogo stick you would never come back.
Pogo Stick Jump
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Explanation
Experiment
Explain Bear
Listen up, chucklehead! This joke is about how super skinny you are. Like, so skinny that if you jumped on a pogo stick, you'd just keep going up and never come back down to earth. It's a funny way of saying you're lighter than air, which, based on your intellect, is probably true!