1. The explanation of a man's way of thinking, actions or thought process, to friends typically, in such a way that does violate sacred, holy, man law, nor the customs of manliness.
2. Also functions as the act of explaining ones feelings or emotions to a woman or man, in a practical, logical, manly way.
John's mansplanation for changing his outfit several times over before hitting the bars, was accepted by both his male and female peers, without derision.