Google and the thesaurus aren't helping, unfortunately.
- Anybody can ask a question
- Anybody can answer
- The best answers are voted up and rise to the top
I am not sure of the origin, but if you google "skosh" you'll find plenty of stuff. It's one of those words I often describe as "cute farmer talk."
I believe that the term comes from the Japanese 'sukoshi' which means a little, or a small amount. As a carpenter in Canada, we used the term a lot and after I moved to Japan and became familiar with the language, it occurred to me one day, that I already knew that particular word.