Kernal if defined by someone having two or more chins.The fat rolls under the persons chin and the head expression accociated with it give that person a kernal head.
Also a derivative of KFC founder Colonel Sanders head with it being the foundation to this head expression.
A person with no neck can also be described as having a kernal head.
Look at that fat *(kents) Kernal head.
Man,he's so fat he's got a kernal head.
Dont eat so much otherwise you'll get fat a cop a kernal head.
Look at that fat arsed no necked kernal head.
Background: created by a stubborn kid, who thought it was a real word, since his teacher made a typo on the homework.
Definition: simply, a raw, undeveloped kernel of a growing corn, etc.
Example: There were many green kernals on a young corn cob.