Need to uninstall Homebrew for Mac OSX? This quick guide will help you completely remove it (and all associated packages) from your system.
cd `brew --prefix`
rm -rf Cellar
rm `git ls-files`
rm -r Library/Homebrew Library/Aliases Library/Formula Library/Contributions
rm -rf .git
rm -rf ~/Library/Caches/Homebrew
Please let me know if you have any issues!