Duke's girlfriend is a guest character in the Goof Troop episode "Leader of the Pack". She was at first the girlfriend of Duke and was seen with him at his "turf" Burger Behemoth.
However after, Duke spots Debbie, he ejects his girlfriend out of his car and tries to get Debbie to be with him instead.
But this plan fails and he ends up getting food thrown at him by his now ex-girlfriend as revenge for dumping her.
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