no kidding

US /noʊ ˈkɪd.ɪŋ/
UK /noʊ ˈkɪd.ɪŋ/
"no kidding" picture
1.

no es broma, en serio

used to emphasize that what one is saying is true or to express surprise or agreement

:
I saw a UFO last night. No kidding!
Vi un OVNI anoche. ¡No es broma!
He actually finished the entire marathon. No kidding!
Realmente terminó todo el maratón. ¡No es broma!