na-adjective, adverb, noun or participle which takes 'suru'
exhilarated; all smiles; tickled pink
Colloquial mimetic word describing a state of being very happy, often because of good fortune or success. Can be used adverbially or as a na-adjective.
宝くじが当たって、ウハウハだ。
I won the lottery and I'm over the moon.
彼は昇給してウハウハ
He got a raise and is all smiles.