那咋了

nà zǎ le

Literally says

so what then

Actually means

yeah and? a shameless so-what comeback

When to say it

The ultimate shameless reply. Someone points out you ate the last dumpling, stayed up until 4am, or bought another pair of shoes. Nà zǎ le. It owns the flaw with zero apology. Bold and funny with friends, plain rude to strangers or elders.

Hear it in the wild

我就喜欢熬夜，那咋了？

Wǒ jiù xǐhuan áoyè, nà zǎ le?

I like staying up late, so what?

又买奶茶了？那咋了。

Yòu mǎi nǎichá le? Nà zǎ le.

Bought bubble tea again? And?