I've installed git on my mac, but I don't know how to completly remove it, because I want to reinstall it again...any tips?
It really depends on how you installed it.
Places to look for git:
INSTALL_PREFIX=/usr/local in my case (perhaps /opt/local or something else)
If you installed Git from code.google.com, you can follow the official uninstall instructions:
If you installed it through the Fink package manager, you can remove git with: