Spunk /(spŭṉk)/

Spunk

n.
  1. Wood that readily takes fire; touchwood; also, a kind of tinder made from a species of fungus; punk; amadou.
  2. An inflammable temper; spirit; mettle; pluck; as, a man of spunk. [Colloq.]
    A lawless and dangerous set, men of spunk, and spirit, and power, both of mind and body.