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It's accusations exchanged among people who refuse to accept sole responsibility for some undesirable event - both in daily conversations as well as discussions regarding sports, politics, etc.
It can be a way to avoid shame, distrust or minor sentiments of agony.
Person A: "Why did you eat my lunch?"
Person B: "I didn't do it - (Person C) did it!"
Person C: "No I didn't - You ate his lunch right in front of me!"
Person A: "Come on (Person B), don't play the blame game".
by Jens4805 September 18, 2013