What do you call a mug? A mug dummy.
Mug Dummy
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This "joke" is about calling someone a "mug dummy" because "mug" sounds like "smug," and "smug" means you are too impressed with yourself, which is not smart. You probably think smart people are mug dummies. But you wouldn't know. Okay?