Wp

Wp is a slang word commonly used in RuneScape which stands for wrong person. It is used when a player accidently sends a private message to the wrong user. The reason its use is so common is because players on the Friends list are displayed fairly close together, so during a conversation it isn't uncommon for players to click the name of a player above or below the intended recipient without noticing, quickly type a message, and send it. It is usually responded to by '?' or 'What?', and the sender will quickly say 'Wp' to the unintended recipient, and retype his message to send it to the correct recipient.