PP rain Share definition Flag It's usually used in Twitch.tv chat when a popular song from the game "Osu!" comes up and that song is worth alot of "PP" (in Osu!, PP is like a ranking system). (The song "Highscore" comes up) "OHHH PP RAIN" PP rain by nTold October 15, 2016 0 0 Get merch Get the PP rain mug. Buy Now — $32.95 See more merch
