An onomatopoeic adverb for chirping sounds (cheep cheep) — the light peeping of chicks or small birds; often used in children's language or as a sound effect.
ひよこがぴよぴよ鳴いている。
The chicks are chirping (cheep cheep).
朝、窓の外で小鳥がぴよぴよさえずっていた。
In the morning, a small bird was chirping outside the window.
赤ちゃんが『ぴよぴよ』とおもちゃの鳥の声を真似した。
The baby imitated the toy bird's 'cheep cheep' sound.
An onomatopoeic/mimetic sense for gentle, light movements — small, cute, or bouncy motions.
カーテンが風でぴよぴよ揺れている。
The curtain is gently fluttering in the breeze.
髪先が歩くたびにぴよぴよ跳ねる。
The ends of her hair bounce lightly every time she walks.
おもちゃの羽がぴよぴよ動いて子どもが喜んだ。
The toy's little wings fluttered and the child was delighted.