The word "weenie" is a direct, informal American English adaptation of the more formal "wiener," itself short for the German "Wiener Würstchen" (Viennese sausage). The "-ie" suffix, a common feature in English for creating diminutives or familiar terms (as in "doggie" or "auntie"), was appended to create a colloquial and slightly childish variant. This process of familiarization through suffixation led to the primary meaning of a small sausage. Subsequently, American slang applied the term metaphorically to a person, drawing on connotations of smallness and insignificance to imply timidity or weakness, completing its semantic journey from a specific food item to a character descriptor.

This word is a simplex loanword and diminutive formation. Its core is the German-derived root "wiener" (from "Wiener Würstchen," meaning Viennese sausage). The "-ie" ending is an English diminutive or familiarizing suffix, often used to create informal or affectionate nicknames.