The term 'MILK, SO TO SPEAK' is a phrase used to describe something that is not what it appears to be. It is often used to describe a situation where someone is trying to pass off something as something else, or when someone is trying to deceive another person. The phrase is derived from the idea that milk is often used as a metaphor for something that is pure and wholesome, while the phrase 'so to speak' implies that the thing being described is not actually what it appears to be.