no kidding

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

冗談抜きで, 本当に

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

:
I saw a UFO last night. No kidding!
昨夜UFOを見たんだ。冗談抜きで
He actually finished the entire marathon. No kidding!
彼、本当にマラソンを完走したんだ。冗談抜きで