GNU Collaborative International Dictionary of English

Found one definition

1.       
   Shebang (?), n. [Cf. Shebeen.]
   1. A jocosely depreciative name for a dwelling or shop; a primitive dwelling; a shanty. [Slang, U.S.]
   
   [1913 Webster]
   
   
   2. The structure of an object, process, organization, or anything viewed as complicated; -- used primarily in the phrase the whole shebang; as, “it comes with unnecessary frills, but you have to buy the whole shebang”. [informal]
   
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   3. (computers) [Possibly derived from shell bang; the character ! is referred to in some computer contexts as bang.]  The character sequence #!, which frequently begins shell scripts in  a Unix system.
   
   [PJC]