Black-cow is a term used to describe a drink that is made by combining cola and stout. The mixture results in a beverage that has a complex flavour profile and is enjoyed by many. However, there are several other terms that can be used to refer to this drink. Some people call it a half and half, while others refer to it as a black and tan. In Ireland, it is known as a pint of plain and is a popular choice among locals. No matter what you call it, this unique beverage is a delicious way to combine two classic drinks and is sure to be a hit with anyone who gives it a try.