うふふ (ufufu) Japanese meaning: tee-hee | KotomoraうふふUsage72%
Standard hiragana spelling for this feminine giggling interjection.
ウフフUsage28%
Katakana variant, often used for emphasis or in manga.
Etymology
Onomatopoeic/mimetic word imitating a soft, feminine giggle. The exact origin is uncertain.
