The condition in which an individual falls asleep with a doo-rag tied too tightly to their dome (head) and comes to school the next day with a massive imprint across their forehead. This visible scar typically doesn't fade for at least 24 hours, and the subject is prone to being dissed or made fun of by fellow peers throughout the day.
Nick: Man, look at you. Why do you have that massive imprint across your forehead?
Evan: Dude, I was wearin' a doo-rag last night and fell asleep with it on too tight.
Briar: Dang, you've got a rag-dome.
Carter: Haha, that sucks for you.