also: ひひひ
interjection
hee hee hee; chuckling; snickering
Onomatopoeic interjection representing a restrained, often mischievous or creepy chuckle.
彼は悪戯を考えながら「ひひひひ」と笑った。
He chuckled 'hee hee hee' while thinking of a prank.
闇の中で「ひひひ」という不気味な笑い声が聞こえた。
In the darkness, an eerie 'hi hi hi' laugh could be heard.
Mimetic word derived from the sound of a restrained laugh. The exact origin is uncertain, but it follows common Japanese onomatopoeic patterns.