Pronunciation: (wä'wä"),[key] —adj. producing a muted, bawling sound like that of a trumpet with the hand moved momentarily over the bell: a wah-wah effect on a synthesizer; a guitar with a wah-wah pedal.
—n. 1. a sound or effect like the muted sound of a trumpet, esp. in music.
2. an electronic device or attachment to produce such a sound, often used with an electric guitar. Also,wa-wa.