https://github.com/mxcl/homebrew/wiki/FAQ
How do I uninstall Homebrew?
Homebrew doesn’t write files outside its prefix. So generally you can just `rm -rf` the folder you installed it in.

If you installed to /usr/local then you may prefer the script in this gist because it will only remove Homebrew
and the stuff Homebrew installed leaving anything else in /usr/local alone.

You will probably also want to wipe the cache: rm -r ~/Library/Caches/Homebrew

うんにゃ…少なくともわかりやすい所には
書いてねぇな…見落としてるだけかも試練が…あとこれだとmakeでいれたのは消えないな