It's the first thing on my mind in the morn' when I roll over

from Killer Mike (Ft. Big Boi & Sleepy Brown) – A.D.I.D.A.S Lyrics on Rap Genius

Meaning

Allusion to nocturnal penile tumescence. Better known as morning wood.

http://en.wikipedia.org/wiki/Nocturnal_penile_tumescence

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