(informal) very quickly

Synonym of know someone from Adam

Alternative form of know someone from the man in the moon

(colloquial, chiefly Australia, New Zealand) To be in a clear state of mind.

(colloquial) Used when a speaker attempts to categorize an observable fact or event, although the category is subjective or lacks clearly defined parameters.

Alternative form of do you know what I'm saying

(rhetorical question, colloquial, childish) Assertion that an insult made by the party to whom the phrase is directed is actually true of that party, and not of the person using the phrase. Usually considered to be a playground taunt.

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.