Yolky is a term used to describe the yellowish color of egg yolks. It is derived from the word 'YOLK, ' which is the yellow center of an egg. Egg yolks are high in fat and cholesterol, but they are also a good source of vitamins and minerals. Egg yolks are often used in baking and cooking, as well as for making sauces and custards. Yolky is also used to describe other things that have a similar yellowish hue, such as certain types of cheese and some fruits.