Origin: 1910–15, Americanism; < It (Neapolitan dial.) guappo swaggerer < Sp guapo pimp, ruffian, via dial. F < L vappa wine that has gone flat, worthless person; initial w perh. by assoc. with a related Gmc word
wop (wŏp) n.
Offensive Slang Used as a disparaging term for a person of Italian birth or descent.
[Italian dialectal guappo, thug, from Spanish guapo, handsome, dashing, braggart, bully, from French dialectal wape, rogue, from Latin vappa, flat wine, scoundrel.]