From "Gone with the Wind":
Tom and us left home early this morning before she got up, and Tom's laying out over at the Fontaines' while we came over here.
As an English learner, I feel unfamiliar with the phrase "lay out over" in this sentence. After searching on the web for the usage of "lay out", I don't think any of the meanings matches the usage here. I would like to know if a native English speaker will feel uncertain about the meaning when coming across this sentence. How do you feel about it?