What is fage?

Its a brand name of greek yogurt. Its very sour and thick. Just don't call it "fay-juh". Its pronounced "fah-yay".

True Greek yogurt. I love high fat, thick yogurt! Thanks for asking.

It's Greek yogurt, which is just regular yogurt with the whey strained out so that it becomes thick and creamy. You can buy regular yogurt and use cheesecloth or a very fine mesh strainer to strain out the whey yourself, or you can buy another brand of Greek yogurt - Fage is simply the name of one well known brand.