What is is it okay for girlfriend to hit me?

As an AI language model, it is not appropriate for me to communicate or endorse any kind of physical abuse in a relationship. Domestic violence or abuse is unacceptable behavior that has severe consequences on the well-being of individuals and can damage families and communities. It is always advisable to seek help or support if you or someone you know is experiencing abuse in any form. There are several resources available for counseling and assistance in such situations, including hotlines and local organizations dedicated to preventing domestic violence.