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1.
Conduct that is unfair, unethical or illegal. Being deceitful or deceptive for unfair advantage.
The only reason Charlie keeps winning is he's just playing some dirty pool to create an advantage over his competition.
by GF Ed February 12, 2005
196 16
 
2.
When somebody does something that is unfair and/or a bad situation
JP: Hey do you want to drive me home from the gym, Jack: Sorry man im going in the hot tub
JP: Dirty pool
by jjct January 19, 2011
11 44