To loaf about, in pajamas, slippers, etc., on a day that a person could or should be more productive but, instead chooses to relax, and shirk responsibility. To purposely spend the entire day looking as if you just awoke. This is what it means to boo hag, or to be a boo hag.
Dion spent the entire weekend dressed in only a bathrobe , dirty tee shirt, and slippers. He ate cereal out of the box, chatted on the phone, and became a serious boo hag.
Peter Gibbons, played by actor Ron Livingston in 1999's "Office Space" is a perfect example of a boo hag; as is, Jeffrey Lebowski, aka,'The Dude', in the Coen brothers film "The Big Lebowski".
Dressed in pj's, bathrobe, and slippers, these two characters waste time, while looking terribly relaxed when they should seem more concerned about their circumstances.