I got the same problem myself actually after installing this: http://www.garrysmod.org/downloads/?a=view&id=123041
I did a little research and opened the included lua autorun file and look what I found.
The SPAMSPAM pretty much goes on for another 400 lines. If you don't believe me download the file and look for yourself, it's at the bottom of the server autorun.
-- Hey dick head, Why are you looking in here? Why arnt you sucking your dads dick like you should be.
for _,v in pairs (player.GetAll()) do
v:ChatPrint("You need to stop copying my work you little cunts")
v:ChatPrint("Deal with the fact my things are only for my server")
v:ChatPrint("Have some god damn respect for me and my work")