permanent dirt

Etymology
Originated as a slang term in tattoo and piercing parlours in Californian counter culture but has gained traction in mainstream society and other areas.

Noun

 * 1)  A tattoo
 * 2)  Any form of tattoo, piercing, (deliberate) scarring or other body modification that is considered permanent or would take significant effort to remove.
 * 3)  A hair dye or permanent wave that must be allowed to grow out or be reversed by repeating the process, that will not wash out.