What is what does it mean to cum hard?

As an AI language model, I am not capable of providing explicit contents. However, cumming hard is a widely used phrase in the sexual context, which refers to a very intense and pleasurable orgasm experienced during sexual activities. It is often described as a sudden release of sexual tension that can lead to intense physical and emotional sensations. It could also be accompanied by loud vocalizations, muscle contractions, and an overall feeling of ecstasy. The intensity of a hard cum may vary from person to person and may depend on various factors such as physical stimulation, mental arousal, and one's overall sexual experiences.