摸鱼

mōyú

Literally says

to touch fish

Actually means

to slack off at work while looking busy

When to say it

Scrolling your phone, shopping online, or chatting during work hours while the boss thinks you are working. Say it about yourself with a grin, or tease a coworker with it. Everywhere in office chat, just never admit it upward.

Hear it in the wild

上班时间别摸鱼了。

Shàngbān shíjiān bié mōyú le.

Stop slacking off during work hours.

下午没事,摸鱼半小时。

Xiàwǔ méishì, mōyú bàn xiǎoshí.

Slow afternoon, so I slacked off for half an hour.