The Collaborative International Dictionary of English v.0.48:

Spang \Spang\, v. t.
   To spangle. [Obs.]
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The Collaborative International Dictionary of English v.0.48:

Spang \Spang\, v. i.
   To spring; to bound; to leap. [Scot.]
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         But when they spang o'er reason's fence,
         We smart for't at our own expense.       --Ramsay.
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The Collaborative International Dictionary of English v.0.48:

Spang \Spang\, n.
   A bound or spring. [Scot.] --Sir W. Scott.
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The Collaborative International Dictionary of English v.0.48:

Spang \Spang\, n. [AS. spange a clasp or fastening; akin to D.
   spang, G. spange, OHG. spanga, Icel. sp["o]ng a spangle.]
   A spangle or shining ornament. [Obs.]
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         With glittering spangs that did like stars appear.
                                                  --Spenser.
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WordNet (r) 3.0 (2006):

spang
    v 1: leap, jerk, bang; "Bullets spanged into the trees" [syn:
         spang, bang]