When referring to "massage gun in ass," it typically means using a massage gun to target the gluteal muscles (buttocks) for muscle recovery and pain relief. These muscles can become tight from sitting, exercise, or everyday activities. Using a massage gun on gluteal muscles can help release tension, improve blood flow, and reduce soreness in the area, contributing to better hip mobility and overall comfort. It's crucial to use the appropriate attachment and avoid direct contact with bone or sensitive areas, ensuring safe and effective application for muscle recovery in the glutes.