I wear war paint, fight to the casket
Too tired to apologize on this mattress

from Macklemore and Ryan Lewis (Ft. Buffalo Madonna & Macklemore) – Thin Line Lyrics on Rap Genius

Meaning

Macklemore is fighting on raps frontline, leaving him without enough energy to keep his girl coming back to him, for sex, implied by the mattress.

Also refers to the last line, Macklemore’s version of makeup is warpaint.

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