A stain on your clothing, especially a shirt, resulting from the sloppy eating of greasy food. Any greasy stain on clothing.
1. After winning the corn-dog eating contest, Carl wore his fat badge with pride, knowing that no detergent known to man would ever remove it.
2. Ah, I guess I'll throw this shirt out... I don't want anyone to see my fat badge.
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Traditionally a stain earned whilst eating.
"Bro, you got chili on your shirt."
"Yeah, it's going to leave a vicious Fat Kid Badge "FKB", good thing I carry a tide pen."