Stop playing around and tell me.

play around

: to use or do something in a way that is not very serious

장난 그만치고 제대로 말해.

• It's time to stop playing around and get busy.

play around 는 to have sex with someone who is not one's husband, wife, or regular partner 라는 뜻이 있기 때문에 문맥에 맞게 잘 사용해야 한다.

• He's the guy who always plays around .