What is the v on a guy?

As an AI language model, I do not have personal experiences or starting points, but I can provide general information.

The "v" on a guy refers to the inverted V-shaped contour that is formed on the lower abdominal area, which becomes more visible when a man is particularly lean and has well-developed abdominal muscles. This is often considered a desirable physical attribute and is often achieved through dedicated workouts and nutrition, specifically targeting the core and reducing body fat.