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

As an AI language model, I am unable to offer opinions, but I can provide factual information.

When a guy cums fast, it means that he experiences ejaculation sooner than he or his partner may have anticipated or wanted during sexual activity. This is commonly referred to as premature ejaculation and is a common issue for many men. It may result from physical or psychological factors, including stress, anxiety, or certain medical conditions. Some men may seek treatment or therapy to address premature ejaculation if it becomes a persistent issue in their sexual relationships.