Sideburns that have grown to a size at which they have overtaken the edges of the face and are working their way towards each other. Possiblythe best thing to happen to the side of the head since ears.
When an overweight man or woman deliberately refrains from wiping their ass, and sits on the face of a consenting or non-consenting individual, giving said individual the appearance of having long, shitty mutton-chop sideburns
Guy 1 (Submissive): Make sure you perch right, lest the middle of my face get covered in shit
Guy 2 (Dominant): Don't worry. I've done MississippiMutton Chops before