Also known as: マトンチョップ
Sideburns that are narrow near the ear but broad and rounded near the chin, forming the shape of a mutton chop.
Mutton chops often look like a beard without hair on the chin (post #2560565), or stretch down past the cheeks and into a mustache (post #3671798). In the latter case, they are known as Friendly Mutton Chops.