D defs.my
Entry 3 senses Webster, 1913

spanking

· spank·ing · IPA /ˈspæŋkɪŋ/
01 a. Moving with a quick, lively pace, or capable of so doing; dashing.
  1. 1.
    Moving with a quick, lively pace, or capable of so doing; dashing.
    “Four spanking grays ready harnessed.” — G. Colman, the Younger.
  2. 2.
    Large; considerable.[Colloq.]
  3. 3.
    Very; extremely; -- used especially in the phrase spanking new or brand spanking new, meaning completely new and unused.[informal]