unscrupulous; nasty: a down-and-dirty election campaign.
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British Dictionary definitions for down and dirty
ruthlessly competitive or underhand: if Bush gets down and dirty the Governor will give as good as he gets
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
Other Idioms and Phrases with down-and-dirty
Vicious, not governed by rules of decency, as in The candidates are getting down and dirty early in the campaign. [Slang; early 1980s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.