I'd like to create display a "status" message that's not a post as I don't

Is there a widget/plugin that will let me easily publish a one line message as to what I'm doing right now. It's not worthy of a post and I don't want to archive it. If you goto this page (parkerati.com) you'll see a yellow box at the top. If you've seen people publish what song they're listening to on Spotify or if you've seen someone's chat status published, you get the idea. Ideally it would be a desktop app or widget or menu bar that could be easily updated throughout the day. Is there anything like this?