Harry Styles tweeted "the oooly toooly" so millions of girls are going to make it a worldwide trending topic even though they have no idea what he's talking about. Welcome to the world of fangirls.
"twitter tool." Term used to describe annoying people who use Twitter mainly for marketing purposes or for spamming others with links to their own products/services. See webcock.
It was unintentionally coined by Guy Kawasaki on a blog post titled "How to Use Twitter as a Twool," where he outlined the steps for using Twitter to market your own stuff. People who follow this advice will think they're using "Twitter as a tool" (a twool) when in fact they have become twools themselves.