Means don't move, freeze. Stay quite!
Things may get crazy, just sit chilly and you will be fine.
Dupchner is the big meal you eat that is not lunch, supper, or dinner.
Missed lunch gonna feast on dupchner.
When you have lunch, supper, or dinner at the same time it is referred to by the upper class as Dupchner.
Better have a big breakfast this morning because after the tour today we only get Dupchner.