Surly Duff - Wikisimpsons, the Simpsons Wiki

Surly Duff is one of The Seven Duffs. Along with the rest of the group, Surly is a mascot for Duff Beer and appears as a costumed character in places such as Duff Gardens. However, Surly has also been seen out in public on occasion.

Season 4, Simpsons Wiki

Duff Beer, Simpsons Wiki

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