This is the second in the “Fire and Fury” malaphor series. Steve Bannon, quoted in Michael Wolff’s book, was talking about how Mueller’s investigation is about money laundering:
“You realize where this is going,” he is quoted as saying. “This is all about money laundering. Mueller chose [senior prosecutor Andrew] Weissmann first and he is a money-laundering guy. Their path to fucking Trump goes right through Paul Manafort, Don Jr and Jared Kushner … It’s as plain as a hair on your face.”
This is a mashup of “it’s as plain as the nose on your face” (very obvious or noticeable) and “not by the hair of my chinny-chin-chin” (never; no way). I suppose a hair on one’s face is also noticeable, depending on the location. A big thanks to Tom Justice and Ron MacDonald for both spotting this malaphor and sending it in!