진짜 + adjective/verb: 진짜 맛있어요; as a question: 진짜요?
really, seriously; real thing (noun)
Example
이 영화 진짜 재미있어요.
This movie is really fun.
Word parts
진 true
진 true + native -짜 (thing). Opposite: 가짜 (fake).
Good to know
More casual than 정말; very common in everyday speech.
Related words