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Webster 1913 Edition

Adj.

Of or pertaining to pepper; having the qualities of pepper; hot; pungent.

Fig.: Hot-tempered; passionate; choleric.

☞ As prepared from the glandular layer of pigs’ or calves' stomachs it constitutes an important article of pharmacy.

peppery ‎(comparative pepperier, superlative pepperiest)

Having the taste of pepper.
Having a fiery temperament.
a peppery old Army major
- 1884, Princess Ida, by Gilbert & Sullivan
  For I'm a peppery potentate, / Who's little inclined his claim to bate, / To fit the wit of a bit of a chit, / And that's the long and short of it!

having a fiery temperament