I put that on my sub, how could you ever doubt me?

from A$AP Rocky (Ft. Action Bronson, Big KRIT, Danny Brown, Joey BADA$$, Kendrick Lamar & Yelawolf) – 1 Train Lyrics on Rap Genius

Meaning

Reference to his “My Sub” series of songs.

If Krit’s putting something on his sub, you know he’s serious. Dude loves to blast the bass.

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