It stands for "copy and paste". It's a ROBLOX trope that originated from the dreaded rogangsters. They're called CNPs because their outfits all look the same, and they're hated because their attitudes are horrible, crass, and hostile for no reason. ROBLOX YouTuber greenlegocats123 did a pretty good video covering them: https://youtu.be/dejWAPYQl2w
