Meaning of "to charm the skin off a snake"?
This is a phrase originated from *Dead Run* by Erica Spindler. Hereunder is the context in the book that I googled. > Rick’s Island Hideaway was the quintessential Key West bar: Jimmy Buffet on the sound system; killer frozen margaritas; a friendly clientele whose attire never veered far from shorts and Hawaiian-print shirts; walls hung with maritime paraphernalia, including a stuffed sailfish and a signed photo of Key West’s most famous onetime resident, Ernest Hemingway. It was the same photo that could be found in about ninety percent of the Duval Street drinking establishments.> And last but certainly not least,a bartender who could ***charm the skin off a snake.***What does "charm the skin off a snake" mean exactly? And how to use the phrase nowadays?