wah-wah
noun/ˈwɑː wɑː/
/ˈwɑː wɑː/
[uncountable] (music)- a special effect made on electric musical instruments, especially the guitar, which varies the quality of the sound
（尤指吉他等电子乐器发出的）哇音；“哇哇” 音响效果 Oxford Collocations DictionaryWah-wah is used before these nouns:- pedal
Word Origin1920s: imitative.