What is wet behind the ears?

The phrase "wet behind the ears" is an idiomatic expression that refers to someone who is inexperienced or immature, often in a particular field or endeavor. The saying is believed to have originated from the idea of a newborn animal, like a calf, that is still wet behind the ears after birth. This imagery is used to describe someone who is new and still has much to learn about the world or a specific activity. Thus, calling someone "wet behind the ears" suggests that they have yet to become seasoned or fully knowledgeable in their area of involvement. It is often used in a light-hearted or gently teasing manner to emphasize inexperience.