To “pop your clogs” means to die.

This cheery phrase is widely believed to originate from Northern factory workers around the time of the industrial revolution. When they were working on the factory floor, employees had to wear hard clogs to protect their feet.

“Pop” has evolved from “cock,” and when someone “cocked” their clogs, the toes of their clogs pointed up in the air as they lay down dead.

“Did you hear what happened to John’s old man? He popped his clogs, didn’t he…”