I quite like the so-called hard boiled fiction of Raymond Chandler, Dashiell Hammett and so on.
Very often, a young male character is referred to as a “gunsel”. In one book, it is explained that this means a young man carrying a gun.
However, it’s not correct. As far as I understand it, a gunsel is a young man kept by an elder as a homosexual partner. You can see it in The Maltese Falcon.
Wilmer is the gunsel. It’s used as a person with a gun,which he does have, but I always assumed it was (also) meant as a secret reference to homosexuality.