Since I decided to start class this, all black, all glass
Panoramic roof been gettin' marked absent

from Royce Da 5'9" (Ft. Eminem) – Writer's Block Lyrics on Rap Genius

Meaning

Royce is using wordplay to create a metaphor here saying that he is the teacher(the head of the class) and he is starting this class (or style.) In his Aston Martin is all black and is missing its roof(marked absent.)

To help improve the meaning of these lyrics, visit “Writer's Block” by Royce Da 5'9" (Ft. Eminem) Lyrics and leave a comment on the lyrics box