ニヤニヤ
niyaniya

Suru Verb
To-Adverb

1. grinning; smirking

Onomatopoeia
なにニヤニヤしてるんだよ。何 なんかいいことあったのか。
nani niyaniya shiteru ndayo. nanika ii koto atta noka.
What are you smirking at? Did something good happen?
Other forms: