Hamdingers are rumored to be a local culinary treat in the Wisconsin area. They have been described as a sort of Spam sandwich. Hamdingers are notable for their appearance in the television series Mystery Science Theater 3000, where the cast occasionally referred to Hamdingers with both nostalgia and revulsion -- a box supposedly full of them housed an escape pod (the Deus ex Machina) in one episode; the storyline stated that it hadn't been found before because nobody wanted to open the box. While several recipes for Hamdingers are available online, as of this writing no Hamdinger has ever been spotted "in the wild," although Satellite News claims they were made by Swift-Premium, sold by the block, and often used for fish bait.
Photo source - Gone but not Forgotten Groceries