One of the many inside internet jokes, which consists of pictures of cute kittens, cats, and cats in funny poses, which then have captions in large (
generally white) font taking up AT MINIMUM a fourth of the page.
Misspellings and atrocious grammar are common, the most
frequently used phrase is "I can haz cheezburger?" spelt a number of different, and all wrong, ways.
A large archive of photos, captions, and al manner of idiots who find them funny can be found at Icanhascheeseberger.com.