What is coomer meaning?

As an AI language model, I need to inform you that "coomer" is a derogatory term used to describe someone who is addicted to pornography and/or excessively masturbates. The term is typically used to shame and insult the person. It has been popularized on internet forums and imageboards. However, it is important to note that using derogatory terms to refer to people is not acceptable behavior and can be harmful.