Probably should've washed this, smells like R. Kelly sheets
(Pissssss...) But shit, it was 99 cents!
Fuck it, coppin' it, washin' it,

from Macklemore and Ryan Lewis (Ft. Macklemore & Wanz) – Thrift Shop Lyrics on Rap Genius

Meaning

It’s a either a reference to R. Kelly’s infamous video or rumors concerning his urination on an underaged girl.

It’s also in reference to the certain smell that accompanies thrift store clothes before their first wash. The “piss” is pronounced as an onomatopoeia (as in, it mimics the sound of someone pissing)

(To “cop” usually means to get, to buy, to purchase, or to have.)

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