The Idiom Attic - a collection of hundreds of English idioms, each one explained.
The meaning of "well hung"
" Well hung "
Said of a man with large genitals.
The legend is that Errol Flynn was well hung, but it's probably a myth.
Where did it originate?:
The idiom might be thought to be fairly modern but, in fact, its first use was in Britain in the 17th century. Before being applied to humans the expression was used to refer to dogs that had large ears.