US Navy and Marine Corps reference to a dude, a man, a male of the human species. Often used plurally.

someone who is sexy beyond mean

Refers literally to a man, but specifically to someone whose skills or physical stature make him especially intimidating. A badass. Can be used metaphorically to refer to a woman, as long as she is a total badass at something.

There is a common misconception that this term refers to any male because it references the male organ, but the more important part of the term is "swingin'." That is, not just any man, but an especially potent or imposing man. Hence, a badass.

A big time mover and shaker, one who feels their self-importance to society is so high that they use extra starch on their shirts as if they were on their way to a Dracula convention.

Military term used to describe any man able to walk. If you were walking your dick was swinging hence the correlation. Particularly remembered from the American/Vietnam conflict.