Meaning

noun an entire system; used in the phrase `the whole shebang'

originUnknown. First attested in 1854 in Pennsylvania as "chebang" in the sense of an Oddfellows lodge. Attested from the early 1860s with the meaning "inn" and (slightly later) “temporary shelter”. The earliest attestions (1854-1859) are spelled "chebang" and abstractly seem to indicate an "affair," "matter of concern," or "happening," in keeping with the modern sense, and seem to be from Midwestern…

Etymology from Wiktionary, CC BY-SA 3.0