Imperial Snow Angel
Snowtroopers were a special breed of Stormtrooper. They had different helmets and they were in the snow. And because they were in the snow, they had snowball fights and made snow angels. Like this.
When a Snowtrooper falls into the snow and swishes his arms and legs, it's called an Imperial Snow Angel. When a Snowtrooper has been outside in the snow for way too long (and/or just because) and can't hold it any more, it's called... nevermind. Just do us a favor: when you're on Hoth... don't eat the yellow snow.