The word 'wop' entered American English slang in the early 20th century as a derogatory term for Italian immigrants. Its exact origin is uncertain but is most commonly traced to the Southern Italian dialectal word 'guappo', meaning a swaggerer or bold, showy fellow, which itself derives from the Spanish 'guapo' (handsome, dandy). An alternative, less substantiated theory links it to the acronym "W.O.P.", allegedly standing for "Without Papers," referring to immigrants without proper documentation. Regardless of its precise pathway, the term's evolution reflects a process of linguistic reduction and pejoration, where a foreign language term was clipped, anglicized, and repurposed as a racial slur targeting a specific immigrant group.

This word is a simplex loanword and cannot be meaningfully segmented into productive morphemes within modern English spelling.