I spit 'til I feel my breath
Who sinkin' my fuckin' chest

from Kendrick Lamar (Ft. ScHoolboy Q) – 6'7 Lyrics on Rap Genius

Meaning

He raps until he physically can’t anymore

To help improve the quality of the lyrics, visit “6'7” by Kendrick Lamar (Ft. ScHoolboy Q) Lyrics and leave a suggestion at the bottom of the page