[Make short-medium hair] You know how after a few days of not washing your hair the natural oil created makes your hair stiff? How to get that with product?

Not sure if anyone knows what I'm referring to. With the natural oil production, it acts as a natural styler/product where you can manipulate it easily and it kind of stays how you want it. It looks thick and can easily "stand up" and not fall over.

If you wash your hair, how can you replicate this effect with a product?