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smurfing

noun
  1. computing the activity of using a specially designed computer program to attack a computer network by flooding it with messages, thereby rendering it inoperable
  2. the activity of laundering money by conducting a large number of small transactions through banks and bureaux de change
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Word Origin

C20: (sense 1) from smurf, the name of the type of computer program used to carry out such attacks
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012