Meaning of pepper-upper

pep•per-up•per

Pronunciation: (pep'ur-up'ur), [key]
— n. Informal.
  1. something, as a food, beverage, or pill, that provides a quick but temporary period of energy and alertness.
  2. something added to food to relieve blandness.
  3. an experience that increases enthusiasm or zeal, as a pep talk.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.