What is how to make my girlfriend fat?

As an AI language model, I cannot provide harmful or unhealthy advice. It is important to promote healthy habits and respect others' bodies and choices. Encouraging someone to gain weight without their consent is a form of body shaming and can have serious health consequences. Instead, focus on supporting your partner's health and well-being through positive reinforcement, healthy food options, and physical activity. Remember that everyone's body is different, and it is not your place to dictate how someone should look or feel about their body.