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[Abbreviation] for silly duffer brother. SDB can be used as a noun or adjective to describe an extremely idiotic person (also a nitwit or fool) or an extremely idiotic action. SDB combines Aussie slang (silly duffer) and incorporates a reference to the world renowned Duffer Brothers (American twin brothers who write and direct [science fiction] films, horror films and television shows - including [Stranger Things]).
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