A skier or snowboarder who avidly seeks out the “powder” (light, dry, fluffy snow)
There are lots of fine cutovers into untouched sugar for powder monkeys (snow permitting, of course).
The persons employed to carry gun powder from the ship's magazine to the gun deck during a battle; in the 18th century Royal British and U. S. Navies, this task (also carrying water) during battles became a permanent nickname for the ship's cabin boys and apprentice seamen
someone who carries explosives (as from the magazine to the guns on board a warship)