I'm British and I've never had it, even though it originates from the UK itself. Here's the Wikipedia definition of it: 'Eggnog, egg nog or egg-nog, historically also known as milk punch or egg milk punch, is a rich, chilled, sweetened, dairy-based beverage. It is traditionally made with milk, cream, sugar, whipped egg whites, and egg yolks. '
My bet is that it tastes pretty rich and creamy, something similar to angel delight if anyone has ever had it, but with more of an eggy texture. Guess that's something I need to try this year. ^w^