Sucking dick, as these people tend to work on their knees all day.

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.

The act of slowly applying mortar on the crevices of another person's body, and meticulously placing ceramic tiles on the edge of said person's skin. Also, following with an appropriate amount of grout to the openings between each of the tiles. This should only be performed by adventurous people, and those who are willing to consent to this daring act.