Stick (phrase) - is usually the phrase yelled by legs 1-3 of a 4x100 meter relay to indicated to the relay member they are rapidly approaching to put their hand back so they can pass the baton to them. Think of it as a short way to say "Take this baton and run for your life please"

Pro Tip: make a punching motion when handing the baton off, it reduces the amount of time spent handing off.