Mark: Hey BJ do you why Joe doesn't take anything seriously?
BJ: Ya, its because of the skullet.
Mark: What's that?
BJ: When he went bald on top it only left the partyin the back. Lol.
A dirty hair cut, or a scumbags paradise. The rat-skullet is a sub-species of the mullet and a cross-breed with a rat tail. In order for a person to have such an ugly hair style they should be married to their sister.
who-a, look atdat der rat-skullet, betcha that mutha just ventured a little far away from the park.