GIT - the revision control (not the GNU Interactive Tools project)
The definition of Linus Torvalds :
GIT - the stupid content tracker "git" can mean anything, depending on your mood. - random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant. - stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang. - "global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room. - "goddamn idiotic truckload of sh*t": when it breaks
GIT has been around for a long time before Linus Torvalds picked that unfortunate name; it is a GNU project: GNU Interactive Tools. It's home page is at http://www.gnu.org/software/git. Documentation can be read at http://www.lns.cornell.edu/public/COMP/info/git/git_toc.html. Its Freshmeat entry is at http://unix.freshmeat.net/projects/gnuinteractivetools/. and its FSF Free Software Directory entry is at http://directory.fsf.org/GNU/git.html. It has a Debian package and is part of the standard Debian installation; its package entry is at http://packages.debian.org/stable/utils/git.