Definition
To speak about something without having adequate knowledge or understanding.
胡说八道
He knows nothing about this issue but is talking through his hat.
他对这个问题一无所知，却在胡说八道。
Don't listen to what he says; he doesn't understand the situation and is just talking through his hat.
别听他说的；他不了解情况，只是在胡说八道。
She claims she can solve the problem, but it sounds like she is talking through her hat, without a concrete plan.
她声称能解决这个问题，但听起来她只是在胡说八道，没有具体的计划。