What does hung mean in gay

Hung To posses male genitals that are larger than average, espcially with regard to length, and especially with regard to the penis. Often used with "well-" as an adjective, or else as a simile, as in "hung like a donkey". James is so well-hung his party trick is to tie a knot in it.

In contemporary slang, particularly within sexual contexts, “hung” primarily refers to a man having a large penis. The term is often used to denote not just size but also a sort of desirability or virility associated with the individual in question.