Grant Barrett:

I remember a poem or verse about it. It is a rural, older couple arguing

about who's going to get up and bar the door. I seem to remember the

main refrain is the man saying to the woman, "Katie, bar the door!"

Mark Mandel:

While interesting, I don't think this is relevant to the primary use of the

expression. I'm not knowledgeable about country music, but I get the

sense that there's a long tradition of country songs that take a familiar

phrase and give it a twist...