dumbo
From Longman Dictionary of Contemporary Englishdumbodum‧bo /ˈdʌmbəʊ $ -boʊ/ noun (plural dumbos) [countable] informal STUPID/NOT INTELLIGENTsomeone who is stupidExamples from the Corpusdumbo• So break away, dumbo, instructed a voice in her head.• So where does this leave dumbo?• Wait a few days till dumbo gets bored and strolls in the streets.DumboDumbo the main character in the cartoon film Dumbo, made by Walt Disney in 1941. Dumbo is a young elephant with very large ears, who learns to fly.Origin dumbo (1900-2000) → DUMB1, on the model of jumbo