I would like to see a wah-wah of Indian thieves over a melon like that!
He was the most ordinary kind of gray, jungle monkey, not even a wah-wah or spider face.
It was the death cry of a wah-wah monkey facing the cruel jaws of a crocodile.
I ceased making the sound "wah-wah" only when I learned to spell the word.
1926, in jazz slang, in reference to the effect on brass instruments made by manipulating the mute; of imitative origin. Later also in reference to an electric guitar effect. As an imitation of the sound of a baby crying, it is recorded from 1938. Wah-wah pedal is recorded from 1969. Cf. Chinook jargon wawa "talk, speak, call, ask, sermon, language;" Cree (Algonquian) wehwew "goose," Lenape (Algonquian) wava "snow goose," all probably of imitative origin.
To talk: to be seen waggin' your chin with a sleuth (1920+)