noun, plural so-and-sos.
someone or something not definitely named: to gossip about so-and-so.
a bastard; son of a bitch (used as a euphemism): Tell the old so-and-so to mind his own business.

1590–1600 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
n , pl so-and-sos
1.  a person whose name is forgotten or ignored: so-and-so came to see me
2.  euphemistic a person or thing regarded as unpleasant or difficult: which so-and-so broke my razor?

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Much of their day is about solving the problems of their parishioners:
  so-and-so never seems to be able to keep a job.
When he was about five, the greedy little so-and-so tried to swallow one whole.
No more seven months of frenzied calls and asking your cousin to talk to
He can tell you the odds of so-and-so throwing such-and-such a pitch to
  so-and-so on such-and-such a count.
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