An arrogant expression of one's importance.

(idiomatic) To be aware of where one's interests lie in a situation.

One can never be sure of one's paternity.

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

(idiomatic, vulgar) To have an adequate level of knowledge or skill; to understand what one is doing or talking about.

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

To be knowledgeable about how the world works; to have common sense and judgement.

Alternative form of know someone from Adam

Alternative form of I know you are but what am I

A sarcastic response to when someone is told something obvious