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 3 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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