(sarcastic) Said as a retort to someone saying hey (any sense of the interjection), used to indicate that the speaker disapproves of the usage of the word "hey", perhaps due to a dislike of informal speech.

Alternative form of know which end is up

(idiomatic) To possess sound judgment or common sense; to have a clear understanding of a situation.

(Internet slang) Used to indicate that something has left one in a state of disbelief or confusion.

Conciseness of expression is an essential characteristic of astute, perceptive, or witty remarks.

(idiomatic) Expresses the idea that whatever one does should be done thoroughly; i.e. details are important.

If a wrong is not redressed within a reasonable time, it is as though the wrong were not redressed at all.

People have differing tastes; what pleases one person may displease another.

There is a reason behind even the most odd and seemingly unnecessary action.

(idiomatic, informal) not as bad as one is said to be