Usually happens when there's not a lot of deodorant left on the stick. You're trying to put some on, you press just a little too hard, and the entire deodorant head snaps off, leaving you with nothing. This has happened to almost every guy who uses solid deodorant regularly, and is really annoying.
Something you do when you don't have time for a real shower. You just grab your trusty stick of deodorant, and you lather yourself in it just enough to get rid of the smell.