These lines are called Crainial Sutures, and form when two 'flexible' mebers of the skull meet after a baby is born. As we grow, these gaps ossify and harden. A fully grown skull has hardened sutures...
When the world became populated enough to actually worry about then the time actually was, people had already settled enough towns and villages to have to worry about which town would go where in the...
Zig Zag was a popular brand of "cigarette" rolling paper in the '70's and '80's before EZ Widers totally eclipsed it. If Afroman has any other meaning to the term than two joints, I'm not up on it.