Where did that word come from?

Ryan has finer hair than Scott and 2 bad cowlicks.  I looked at his hair one morning before school and told him that his hair was "cattywampus."  He said "what does that mean?"  I sent him to look in the mirror and saw how his hair was sticking up everywhere.  I don't know where I had even heard this word-is it an old fashioned Southern thing maybe? 

So now Ashley says it too-she told me last night after we had been swimming in the rain and I had dried my hair off with a towel that I had cattywampus hair.  It's funny to hear her say that!