What does ちゃう mean?
ちゃう is a Japanese interjection meaning “no; that's wrong; it's not like that” in English. It is written as ちゃう in hiragana, and chau in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
彼女にばっちりキスされちゃったよ。
She kissed me full on the lips.