"Ever been called a "shreddie", felt like a quick "wallace and gromit", shown your "spider's legs" or been given a "hitler"? If you have, well, so sorry. If you haven't the slightest idea what the terms mean, then Chris Lewis has the very book for you."
--from an online article about playground slang.
The book? The Dictionary of Playground Slang.
The website? Online Dictionary of Playground Slang.
Not for anybody subject to junior high flashbacks.