Photo's of cats doing funny things or in weird (and sometimes almost human) poses. The photos usually have a funny caption under them, the caption is sometimes written in leet speak.
Guy 1: "Yo, check out this photo of some cat with a sniper rifle."
Guy 2: "Wow, thats one funny lol cats picture"
a somewhat annoying dance, done by a cat on the iternet
"Cat, I'm a kitty cat, and I dance dance dance and I dance dance dance"-Cat from The Kitty cat dance