點解d人叫小便做渣渣水

這是形容男性的,
因為男性的生理構造,
他們會站長小便,
而且他們會用手拎小弟弟出來,
渣住它尿尿,以免射到周圍係,
因此,叫做渣渣水~

coz this is Cantonese's style, i think is somepeople 渣 their young "brother", they have some water in hand... so...whatever la...