Roast head refers to an old man who is having an affair with his wife or planning to eat her tofu.

You young people have never seen the original cooking stove, and you don't know what "picking a door" means. In the countryside, it used to be a chafing dish before cooking. The stove of an adobe board is divided into two holes by a grate, and the hole on it is big enough to hold firewood for burning. The hole below is very small, with incomplete burning grass ash. When there is a lot of grass ash in the hole below, you have to pull it out with a small shovel like a scraper. This little shovel is called "shaving your head".

Speaking of which, do you understand the origin of the head? Cut a hole in the bottom.