An onomatopoeia of the sound that young children make when they cry. Of course, the number of "a"s range, from 2 to infinity. Why this habit of "waaaaaaaa"ing fades over time is because as we mature, us humans understand that crying loudly in public is embarrassing, and thus we avoid doing so.
Baby: WAAAAAAAAA!!!!
Mom: Oh, no, the baby's crying!
Firstfour notes of Marvin Gaye's 1973 number one single "Let's Get It On". Although best selling, rarely thought of in the traditional sense as a 'couple's song'.
Instead of using actual words, Blanton preferred to utilize "wah-wuh-wah-waaaaaaah" for his musical mating call.