Those were a-mug-zing jokes. They were Mugderful, and Mugjestic.
Mug Puns
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Explanation
Explain Bear
Okay, so basically, the dude used "mug" as a prefix to make words sound funny. "Mug-zing" sounds like "amazing," "Mugderful" sounds like "wonderful," and "Mugjestic" sounds like "majestic." I get that you didn't get that, but you do you, I guess.