An expression of surprise, annoyance, or disgust to question why something bad has happened to the speaker.

(dialectal or informal) Synonym of how come (“why”)

(idiomatic) used to add emphasis to "why" when beginning question.

Alternative form of FYI

The reason for something (specified) existing; the purpose fulfilled by something.

One will demand or expect justification; used in threats.

(rhetorical question, colloquial) One should not do something that one has hired someone else to do.

(humorous) Expressing reproach when somebody harms or damages something.

(humorous) Being available for sexual relationships with various people is preferable to committing oneself to a single partner.

Alternative form of why buy a book when you can join a library