[Last_Stand_Guardian]

Try:

pawn Code:

public OnPlayerText(playerid, text[])
{
      if(strfind(text, "idiot") != -1)
      {
            new Position = strfind(text, "idiot", true);
            strdel(text, Position, Position+5);
            strins(text, "censored", Position, 10);
            SendPlayerMessageToAll(playerid, text);
            return 0;
      }
}
return 1;

I'm not sure if it works, but it could look like this xD ^^