ふんふん

interjection

uh-huh; mm-hmm

Casual interjection showing agreement, understanding, or listening; often repeated.

• 「明日あしたまでにやってくれる？」「ふんふん、わかった。」

  "Can you do it by tomorrow?" "Uh-huh, got it."

adverb

sniff-sniff

Mimetic adverb for sniffing, often with a cute or childish nuance.

• 犬いぬがふんふんと地じ面めんのにおいをかいでいる。

  The dog is sniff-sniffing the ground.