An expression of enthusiasm made (especially by high mountain athletes) when the action at hand (or ski or wheel) was accomplished with panache.
Comes, of course, from the comic strip "B.C." and then mutated by a notorious Wasatach mountain man into the form of expressive enthusiasm.
See also, "Way Zot!"
"Zot," he cried as the buttery garlic melted - al dente - from the first bite out of the pan.