Pounding Sterling with a Hammer Suggestion of violence against Sterling, metaphorically, by pounding them with a hammer.

Listen up, genius. You think poundin' Sterling with a hammer sounds like a good time? Let me spell it out for ya. "Sterling" usually refers to currency, but here it's likely a person, possibly from a different background than you. The joke suggests violence against this person, which is not only tasteless but also fuels prejudice. Comprende?