Brother you ain't got no inner soul
Put a sock in it

from Labrinth (Ft. Busta Rhymes, Kano, Tinie Tempah & Wretch 32) – Earthquake (All Stars Remix) Lyrics on Rap Genius

Meaning

Pun playing on shoes continuing the clothing references.
Wretch is saying the person has no life in him so he should shut up.
With shoes you should wear a sock if you have no inner soul to avoid blisters and rubbing

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