Japanese phrase
ふざけないでください！ fu za ke na i de ku da sa i
Meaning
Please stop fooling around!
When to use it
A request to stop acting unseriously. The polite form softens the wording, but the phrase still shows irritation or strong disapproval.
Example dialogue
ふざけないでください！ fu za ke na i de ku da sa i
Please stop fooling around!
すみません、ちゃんとします。 su mi ma se n cha n to shi ma su
Sorry. I will take it seriously.