Definition

(he's doing) God knows what: (he's doing) something unknown or mysterious; I have no idea what (he's doing) idiom
(she is) God knows where: (she is) somewhere unknown or mysterious; I have no idea where (she is) idiom
  • "As Horatio is still away from the office doing God knows what God knows where, you have been selected at random to look after his monkeys this week."
  • "As Horatio is still away from the office doing God knows what God knows where, you have been selected at random to look after his monkeys this week."

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