A man or a boy who is famous among all his friends for having a large penis , and sometimes impressive testicles, too. For him,especially when young, this is always something to be proud of in front of boys, and sometimes embarrassing,curiously, in front of girls.
Don't you know that our friend Marc A.has something special? Look at his boardshorts... Yes, he IS well-endowed, he has the biggest one on the beach...Fine, uh?