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Someone who is a silly muffin is someone who is a silly muffin. It is not an insult, so much as a observation about someone.

A silly muffin would most definitely do something silly or unnecessary just because they can. Not something mean though, a silly muffin is not a mean person.
"I go around town wishing people a nice day"

"you're a silly muffin"
by Amasakai November 08, 2013
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