"screw around" in Chinese (Simplified)
瞎搞浪费时间胡闹
Definition
指浪费时间、胡闹，或（非正式，有时粗俗）在性上不忠。
Usage Notes (Chinese (Simplified))
口语/俚语，语气较粗鲁。多用于指浪费时间或胡闹。表示性不忠时，有冒犯意味，慎用。
Examples
Stop screwing around and do your homework.
别**瞎搞**了，快去做作业。
They just screwed around all day at the park.
他们整天在公园里**瞎混**。
Don't screw around with that machine, it's dangerous.
别在那台机器上**胡闹**，很危险。
He's always screwing around at work instead of getting things done.
他总是在工作时**瞎混**，什么都不做。
I heard he's been screwing around behind his girlfriend's back.
我听说他在女朋友背后**偷情**。
We spent the afternoon just screwing around downtown with nothing to do.
我们整个下午都在市中心**闲逛**，什么也没做。