Definition of "dirty pool" []

• Slang Unjust or dishonest conduct. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A friend of mine on the LAPD Riot Squad said 99 percent of your white-on-Mexican assaults weren’t reported and the Mexicans never took the damn sticks to each other, it was considered dirty pool or whatever."