ACRP
It's a cringe person in the video game "Roblox" who is possibly a Slender or a CNP aka copy and paste. Usually rude and the meaning ACRP means A cringe Roblox Player.
Guy 1: "This guy is a slender who told me to mic up he is ACRP."
Guy 2: "Yeah your right."
Guy 2: "Yeah your right."