Etymology
Advertisement
wop (n.)
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 one seems to date only to c. 1985.
Related entries & more 
Advertisement
doo-wop 

style of American vocal group music, usually performed acapella or with minimal instrumentation, 1958, from a typical example of the nonsense harmony phrases sung under the vocal lead (this one, doo-wop, being attested from mid-1950s). Compare bebop, scat (n.1).

Related entries & more