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

It’s a reference to R. Kelly’s infamous video

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.)

It’s also a reference to that R Kelly “allegedly” had sex and urinated on 14-year girl (act, captured in the leaked video).

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