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derogatory for "Italian," 1912, American English slang, apparently from southern Italian dialect guappo "dandy, dude, stud," a greeting among male Neapolitans, said to be from Spanish guapo "bold, dandy," which is from Latin vappa "sour wine," also "worthless fellow;" related to vapidus (see vapid). It is probably not an acronym, and the usual story that it is seems to date only to c.1985.
: big wop tenornoun
An Italian or a person of Italian extraction; dago (1912+)
[apparently fr southern Italian dialect guappo, ''dandy, dude, stud,'' used as a greeting by male Neapolitans]