up satan's left nostril
Used to describe something lost in an area usually frequented by the speaker after they have checked every possible location it could be.
Person 1: Hey, have you seen the tea I bought last week?
Person 2: No, where did you lose it?
Person 1: In my apartment. I've turned the place upside down and the only place it could at this point be would be up satan's left nostril.
Person 2: No, where did you lose it?
Person 1: In my apartment. I've turned the place upside down and the only place it could at this point be would be up satan's left nostril.