Mets Katsu [Female Active] [Noun] 1. An activity where one seeks only physical intimacy without expecting anything in return, like a sugar baby arrangement. 2. A fleeting moment between two individuals who possess a potential beyond that of casual sex, lacking the depth of a lover's affection. They may not know each other's names or backgrounds, but the memory of their physical encounter lingers. A woman who embodies all the ideal eroticism a man desires, coupled with a man who openly expresses his overflowing lust, engaging in a stimulating union.