Good ol' potty humor. Probably the first form of humor most people learn. It's simple and timeless. It can be elegant, vague, and as Steve Nash shows us, wrapped in a masculinity proving double entendre.
According to Jared Dudley's tweet we learn that the video not only stars Nash but also had him as the director.
Nash has a few continuity and dialog flaws to address before he becomes big time director. Like finding a MUCH better analogy to explain a "weak stream" than a firefighter with a huge hose on a windy day.