The story only makes sense if you know:
Mike's favorite reply to the kids asking "Where's my..... ???" is "Up your butt and around the corner." Then he bellows out a laugh, while the kids stare blankly at him.
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I was helping Cole find a matching pair of socks in my mountain (literal mountain) of laundry.
"I found them, Cole!"
Jane, who was "helping" me look, cocked her head and asked:
"Did you find the sock in your butt?"
"What?"
"In your butt, Mom."
"Did I find the sock in my butt!? Oh... like Daddy says?"
"Ya, like Daddy says. In my butt and around corner. Then he laughs real loud."