The Collaborative International Dictionary of English v.0.48:

Scattergood \Scat"ter*good`\, n.
   One who wastes; a spendthrift.
   [1913 Webster]

WordNet (r) 3.0 (2006):

scattergood
    n 1: someone who spends money prodigally [syn: spendthrift,
         spend-all, spender, scattergood]