[very common; prob. based on the "tar baby" in the Uncle Remus folk tales] An archive, created with the Unix tar(1) utility, containing myriad related files. "Here, I'll just ftp you a tarball of the whole project." Tarballs have been the standard way to ship around source-code distributions since the mid-1980s; in retrospect it seems odd that this term did not enter common usage until the late 1990s.
[glossary]
[Reference(s) to this entry by made by: {proggy}{tar and feather}]