My friend told me my wrist wasn't a cutting board. So I asked her if hers was at all, and if I could borrow it.
Cutting Board Exchange
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Explanation
This is a dark joke that uses sarcasm to make light of self-harm, specifically cutting. The user's friend tells them that their wrist isn't a cutting board, implying that the user is self-harming. The user's response is to ask to borrow their friend's wrist, implying that the friend's wrist is also used for self-harm. It's very morbid and disturbing, making it cringe humor.