A person with a recessed chin, who from a side profile apears to have had their neck pinched. The person may also have a cylindrical head (not too different from a peperami).
Alternative names associated with Pinchnecks are:
Gail Platt from Corronation Street has a Pinched-neck.
You walk into room...
Random guy: 'My goodness your neck looks to have been pinched!!' - You are a Pinchneck