Open up the frigerator see some old milk
Shit been sittin' so long look like some old silk

from Young Jeezy (Ft. Jill Scott) – Trapped Lyrics on Rap Genius

Opens the refrigerator and sees milk that has gone bad. Next line is a metaphor referencing the milk is so old it appears to be texture or fabric like (milk is supposed to be liquid, not physical), such as silk. But also references the soy milk brand, Silk.

Silk Soy Milk Brand

Silk Fabric

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