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A pain in the ass who thinks they're cool just because they wear loud shirts.
My cousin is a g-muffin. He wears three G-Unit shirts at once and still doesn't know how to tie his shoes.
My teacher called me a g-muffin because I wore a G-Unit shirt to school on Monday.
My neighbor is a g-muffin. He wears a G-Unit shirt to the grocery store like it's a fancy event.