A gibbon, especially the silvery gibbon or the agile gibbon(noun)
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Use "wow-wow" in a sentence
"Lots of word children use are onomatopoeiae, like wau-wau (pronunciation sowthing like wow-wow) for dog."
"Different researchers classify different calls differently, and no one claims to know what they all mean: some are called “woo-ah” notes, “wow-wow” notes, organ notes, coo notes, rattles, clicks, and chirps."
"Just needed some chick-a- wow-wow guitar in the background..."