I think that’s German for “Fuck you and everyone around you.”
Now imagine this… One of these lil firecrackers stuck to a mess-kit full of frozen feces. Germans who were retreating from the Russian forces would attach these little “surprises” to any large equipment they had to leave behind.
War is already a pisser, now add to that being hit with shrapnel that is actually a frozen turd splinter. Christ war is a dirty racket!