A turkey drawn by placing your hand on the drawing canvas (i.e. chalckboard, paper, wall, etc.) and trace your hand, add a beak, feet, maybe a wing, and that little red flap of skin thing that is customary for turkeys to have.

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.

when you are fingering a girl with four fingers and you then proceed to use your thumb and rub her clit with it while gobbling like a turkey

the process in which when you are four finger-fingering a girl and you take your thumb and rub her clit while making a gobbling sound at the same time.