no kidding
US /noʊ ˈkɪd.ɪŋ/
UK /noʊ ˈkɪd.ɪŋ/

1.
tak main-main, betul-betul
used to emphasize that what one is saying is true or to express surprise or agreement
:
•
I saw a UFO last night. No kidding!
Saya nampak UFO semalam. Tak main-main!
•
He actually finished the entire marathon. No kidding!
Dia betul-betul habiskan seluruh maraton. Tak main-main!