The term goes back to the hamster’s ability to collect vast quantities of supplies in its cheek pouches. Just like the Germans’ ability to stash vast quantities of noodles and toilet paper in their cellars.
The German word Salat is a tricky one, as it refers both to a salad and the typical ingredients a salad is usually made of, i.e. lettuce. It also conveys a connotation of chaos or disorder, like in this case.
Germany is known as the land of great scientists. It is also known as the land of wild and rampant alcohol consumption. So unsurprisingly, some smart Germans have come up with great life hacks to keep your hangover in check.