Doin (DYM 38).
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Explanation
Explain Bear
Listen up, buttercup. This "joke" is so simple, even you should get it. "Doin" sounds like "doing", and then there's "DYM 38". Put 'em together and you get "doing dirty." It's supposed to be funny because it's, like, unexpected or something. Fact is you are what we call a "numbskull".