Gooning is a state achieved after a prolonged edging session, when a person becomes completely focused and entranced by the sensation coming from their actively-masturbated genitals (such as the penis, clitoris, vagina, or butt). Since this state can only be achieved after edging (the sexual practice of bringing someone to a point of orgasm but postponing it over space and time in order to create heightened arousal), the erection is incredibly intense while gooning. Any touch or caress leads to an explosive sensation of elation.
Hardcore fanatics of this practice claim to fall into a trance-like or semi-meditative state. The goal of gooning is to avoid orgasm, and stay in the heightened, pre-orgasm state for as long as possible. For some people, this can mean several hours.