It's used to express a passion for exploring the world of gastronomy or a craftsman's spirit for cooking. It can also convey respect for the best chefs, like a 'Master Chef'.

It brings to mind famous chefs like Gordon Ramsay or culinary researchers popular with the public, like Korea's Baek Jong-won. Sometimes, someone who is bad at cooking might use it ironically to call themselves a 'chef', adding a touch of humor.