The whole shebang

The entire thing, group, operation, or collection. Current informal idiom Regional use: United States, later widespread.

Shebang was U.S. Civil War-era slang for a rough shelter, tent, establishment, or group, probably but not certainly altered from Irish sibin or shebeen, an illicit drink or unlicensed tavern. Literal the whole shebang appears in the late 1860s, and an unmistakably broad all of it sense is in print by 1870. The semantic path from an entire dwelling or establishment to an entire affair is straightforward even though the word's deeper origin is not settled.