I live in Webster Groves, Missouri. I'm the gnome who stalks your edits when you link to football but mean to link to association football or American football (or rugby football, Gaelic football, etc., etc.).
Shelf skew is a term used by book dealers and collectors to describe what happens to a book when, rather than being held upright on the shelf, it is allowed to lean diagonally. One cover is forced up while the other sags, the entire text block is pushed out of alignment, and the spine gets torqued out of shape. So shelf skewed is a book-nerd way of saying twisted.