胡说八道

hú shuō bā dào

to talk nonsense

Character by character

胡hú
wild

说shuō
talk

八bā
eight

道dào
say

别听他胡说八道。

Don't listen to his nonsense.

Tone: negative (criticism).

Blunt and colloquial; rude if said straight to someone's face.

Learn it in context

This idiom and thousands more are in Learn Chinese with Bao, with audio, pinyin and drills that make them stick.