The story
From hopper, as in grasshopper, doze or dose (because conceived as putting insects to sleep or as dosing them with poison), + -er.
Etymology from Wiktionary, CC BY-SA 4.0.
hopperdozer
Today it means: An appliance for the destruction of insects, consisting of a shallow box containing kerosene or coated with a sticky substance, which may be mounted on wheels. Full definition →