Unfortunately, what isn't safe in your kist may not be safe near your keister either.

很遗憾，在你“kist”中不保险的东西，在你“keister”的附近可能也不保险。

Keister may have come from the British dialect kist, which was the northern form of chest.

“Keister”有可能来自英国方言“kist”，也就是“chest”的北方版本。