expression
it's no joke; gimme a break!
Used to express strong disbelief, annoyance, or refusal, often when something is unreasonable or absurd. Can be a literal statement that something is serious, or an exclamation meaning 'you must be kidding!'
こんなに仕事を一人でやれって？冗談じゃない！
You want me to do all this work alone? Gimme a break!
あの事故で誰も怪我しなかったのは、冗談じゃない奇跡だ。
It's no joke that nobody was hurt in that accident; it's a miracle.