フッ
fu'

Interjection

1. hah (derisively); pooh

ふっ、禁断 きんだん魔術 まじゅつとやらは、俺 おれには通用 つうようしないぜ!
fu' kindanno majutsutoyarawa oreniwa tsūyō shinaize!
Hah, your 'forbidden magics' aren't going to work with me!
To-Adverb

2. pfft (of something disappearing); poof

Onomatopoeia
To-Adverb

3. huff; puff

Onomatopoeia