I loved collecting POGs back in the 90s. Me and @NESADDICT ask you, Wanna see my POG Collection? For some reason I loved collecting ying yang POGs. What kind did you like collecting of this 90s milk cap game? Milk caps is a children's game played with flat circular cardboard milk caps. Players make a stack of these caps, and take turns to drop a heavier "slammer" object onto it, causing the caps to be disrupted. The game is also known as Pogs, under which name it was sold commercially in the 1990s. The name originates from Pog, a brand of juice made from passionfruit, orange, and guava; the use of the juice's caps to play the game preceded the game's commercialization.