(astronomy) The cosmic event that marks the beginning of time and the rapid expansion of space for the visible universe. The evolution of the universe since that beginning point is described by the Big Bang Theory.

(vulgar) An orgy, especially a sexual one. / (US, slang) A gang fight. / (US, slang) Protecting gang turf, especially when dealing drugs or other black market objects. / (informal, dated) A gang rape.

(idiomatic, archaic) A farmer's servant, especially a thresher.

(idiomatic, often hyphenated) Good, superior, excellent.

(transitive, informal) To damage. / (transitive, informal) To put someone in prison, or into their individual cell.

(idiomatic) Efficiency; cost-effectiveness; value.

(transitive, idiomatic) To do something quickly, in a slipshod, or unprofessional manner. / (intransitive, aviation, slang) To eject.

(slang) Someone who works or studies seemingly way too much.

simple past tense and past participle of bang up

(informal) Spending time in prison or jail. / (informal) Physically injured or wounded.