Pp is slang for "I want your dick in my ass, immediately." and is primarily used by femboys & traps of the like. Usually the word "performance points" abbreviated into two short letters, and is often used by the osu! community.
Person 1: I just got 100pp, how cool is that?
Person 2: Dude.. That's really gross.
Person 1: :(
it means penis :)
(the fact that you searched for this tho smh)
human: whats a PP??
unholy kid: its a penis you dumb piece of -bleep-