There are a number of SEO and SEM related glossaries on the Internet, but this is the first one I've seen that is humorous. If you need to learn the difference between 404 errors and Latent Semantic Analysis, this is one place you can learn it and still have fun:
Bot: The term bot is used to mean spider, the kind that SEs send to trawl through your site. It's short for ROBOT which is itself short for something else (which I can't remember right now). ROBOT is officially an endangered species, if the word gets any shorter than bot it may become extinct as it's not known to mate and breed successfully in the wild.
Read more at The Alternative Webmaster Glossary