(informal) Used as a rhetorical question to confirm agreement, knowing or understanding at the end of a statement.

Synonym of know one's ass from a hole in the ground

Expertise leads to career promotion.

Synonym of you never miss the water till the well runs dry

Synonym of know one's ass from a hole in the ground

Alternative form of know one's ass from a hole in the ground

Alternative form of learn to walk before one can run.

Third-person singular simple present indicative form of know the difference between one's ass and a hole in the ground

If one does not know about a problem or a misdeed, one will not be able to render oneself unhappy by worrying about it; often used to justify not informing an individual about a problem or misdeed.

What you said is so wrong it reveals you lack basic understanding of the subject or relevant experience.