from the 888 thread:
Referer log spamming
When someone accesses a web page, i.e. the referee, by following a link from another web page, i.e. the referer, the referee is given the address of the referer by the person’s internet browser. Some websites have a referer log which shows which pages link to that site. By having a robot randomly access many sites enough times, with a message or specific address given as the referer, that message or internet address then appears in the referer log of those sites that have referer logs. Since some search engines base the importance of sites by the number of different sites linking to them, referer-log spam may be used to increase the search engine rankings of the spammer’s sites, by getting the referer logs of many sites to link to them.
Go to google, type in
free porno mysite
Just like that. Report the spam you find to google. I found the same crap in my logs yesterday and that’s what I did.
xhttp://www.google.com/contact/spamreport.html