What it means when you say literally.
Thanks to Library Lady Jane for all her help in writing these grammar guides over the years. If you would like a regular serving of grammar-related awesomeness every day, go follow her on Twitter.
Once more I get assistance from Library Lady Jane and The Oatmeal. What do you mean when you say literally? Here we go with what you should be meaning.
Don't forget to scope out the cool posters while you're there!