In my oils

Where does the expression "in my oils" come from? For example "I'm in my oils when driving" or "If I had a yacht I'd be in my oils" meaning that it is a favorite activity or ideal environment. I can't find the expression on any search engines so I wonder if it might be a local phrase.

I have never heard it in my part of the United States -- Kentucky and West Virginia.

I haven't heard it in California. Anyone from somewhere else not heard it? Speak up! ~rb

Never heard it in the UK. (VSD)

Never heard it in Australia, and there are no hits on a google Australia search. There are some on a general google search (once you wade through the pages about oil paint), for example: "And I have to say that once I can lay my hands on said deluxe edition (I'm not sure where I stored it away), I'm going to be in my oils." wordpress.com/ tag/furry/feed/ Pamela