You're so skinny my grandma gonna use you like a cane.
Skinny as a Cane
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Explanation
Explain Bear
Listen up, buttercup. This joke implies that the person is so thin that their grandma could use them as a walking stick. People use cane because they are too weak to walk. It's like calling someone a toothpick, but with a geriatric twist. Is your brain starting to work?