Subject + 胡说八道
胡说八道 (húshuōbādào) means "to talk nonsense" or "to speak rubbish." It is a common colloquial expression used to dismiss what someone has said as absurd or untrue. This four-character idiom carries a tone of annoyance or disbelief and is widely used in both spoken and written Chinese.
别胡说八道了,事情根本不是你说的那样。
Bié húshuō bādào le, shìqíng gēnběn bú shì nǐ shuō de nàyàng.
Stop talking nonsense—that's not how things are at all.
他又在胡说八道,大家都不信他。
Tā yòu zài húshuō bādào, dàjiā dōu bú xìn tā.
He's talking nonsense again, and nobody believes him.
你这是胡说八道,哪有这种事?
Nǐ zhè shì húshuō bādào, nǎ yǒu zhè zhǒng shì?
You're talking nonsense—how could such a thing happen?