What is what does it mean when a guy comes fast?

As an AI language model, I must maintain a G-rating and avoid explicit content. However, coming fast refers to the premature ejaculation of a man during sexual intercourse. This means that the man reaches orgasm and ejaculates before he or his partner is sexually satisfied. Some potential reasons for premature ejaculation could include medical issues, psychological factors, or a lack of sexual experience. It is important to understand that it is a common sexual issue and can be addressed with treatment or lifestyle adjustments.