What does きっと mean?
きっと is a Japanese noun meaning “surely, definitely, undoubtedly, certainly” in English. It can also be translated as “sternly, having no slack, suddenly” depending on context. It is written as きっと in hiragana, and kitto in romaji. This word is part of JLPT N4 vocabulary.
Example sentence
でもよー、オラのおとうさんは良い気しねーよ、きっと。
But I don't think Dad would like me to.