Sausages, particularly hot dogs or frankfurters; slang term sometimes used as a mild insult or for male anatomy.
From German 'Wiener Wurst' meaning Vienna sausage, as these sausages were associated with Vienna, Austria. The term entered American English in the late 19th century with German immigration.
The wiener got its name from Wien (the German name for Vienna), just like frankfurters are named after Frankfurt - European cities were essentially branding their sausage styles. Americans turned these geographic food names into generic terms for hot dogs, regardless of where they're actually made.
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