Garbage rationalization one uses for justifying poor decisions, deceit, inadequacy, etc. They are often fallacy in themselves that they have adopted as truth in their own head so that they can have a justification for their own illogical actions. It becomes a form of "truth" to the person owning it and using it. Although convincing to the one utilizing it the rest of the world can see it for what it is..irrational, illogical and often nonsensical. Ironically the creation of it is often more laborious then if the truth itself was just presented but in the users mind this is the best path.
No woman wants a bs excuse for why a man cheated.