One at a time, I line them up
And bomb on they mom while she watching the kids

from Big Sean (Ft. Jay Electronica & Kendrick Lamar) – Control Lyrics on Rap Genius

Meaning

Kendrick continues to “go at” these fake rappers. Saying he will murder them individually, (metaphorically), by exposing them of what they really are, (fake), and you know it is so embarrassing to be disgraced in front of your mom.

Furthermore, the bomb on they mom sounds like a reference to “Check Yo Self” by Ice Cube

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