Galvanic is an adjective that means sudden and dramatic.
An 18th century Italian physicist Luigi Galvini made a number of key discoveries in the field of biolelectricity. The French word gavanique (gal van EEK) was first coined in his honor. It may help to think of a galvanic experience as sudden like a charge of electricity.
I was stunned by Tyler’s announcement that we had won first prize. The news hit my like an electrical shock.