I use my mouth as a weapon
Bullets rip through your mid section

from Kendrick Lamar (Ft. Punch) – Phone Home Lyrics on Rap Genius

Meaning

Kendrick says his lyrics are his weapons and he kills more rappers this way and they his lyrics rip through shitty rappers. Later in his career he has lines similar like this such as:

What I call the realest comin' from a student
Told myself to use a poem as an UZI

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