This is cross between mommy and porn. Specifically related to books.
For example, "50 Shades of Gray" is considered mommy-porn hence the word morn. It has a double meaning. It's kind of sad that mommies read this, but it's not spelled like "mourn" as in mourning. It's "morn" to make it funny.
by Ceridwen77 February 20, 2014