adverb taking the 'to' particle, adverb, noun or participle which takes 'suru', noun
Describes a state of being flustered, confused, or panicked, often with a sense of hurried, disorganized movement. Used adverbially with と or as a する-verb.
突然の質問にワタワタしてしまった。
I got flustered by the sudden question.
彼は遅刻しそうでワタワタと準備を始めた。
He started getting ready in a fluster because he was about to be late.