Quadchin is a consequence of aging, common among women named Denise. When one ages without grace loose skin begins sagging from the neck area, resulting in skin folds and the "Quadchin".
Did you see Goonie try and push her neck out to hide her Quadchin? Wow
When someone has a double-double chin, esp. if they are from Wales or anywhere in the UK. Eating too many donuts, and drinking too much wine can result in this condition.