doo-wop noun a musical style popular in the 1950s, featuring nonsense syllables sung in close harmony US,1969
We stood on the corners rappin’ and signifyin’ (“you know what, man, yo’ momma is so ugly she can’t even catch a cold”) ’n do’wappin’ (“wop doo-dooo/doo doo doo doo wop doo ddooo”). — Odie Hawkins, MenFriends, p. 9, 1989