Twists, Slugs and Roscoes: A Glossary of Hardboiled Slang

‘If you’ve ever read a hardboiled detective story, you may have come across a sentence like, “I jammed the roscoe in his button and said, ‘Close your yap, bo, or I squirt metal.'” Something like this isn’t too hard to decipher. But what if you encounter, “The flim-flammer jumped in the flivver and faded.”?’