 Sam Spade refers to Wilmer as a "gunsel", a term the censors assumed  was a slang reference to a gunman. The Yiddish term "gunsel",  literally "little goose", *may* be a vulgarism for homosexual (the  word "faigle", or "little bird", is usually used in that manner). It  is more usually an "underground" term which refers to a person who  is either a "fall guy" or a "stool pigeon", in which case Spade is  making both a direct and an indirect reference to Wilmers  character.