busy as a bee

If you are busy as a bee, you are extremely busy at what you are trying to accomplish, typically with a lot to do in a very short amount of time. If you watch the way a bee moves, it will fly back and forth and around in circles at a very fast pace, especially when it is near a beehive and harvesting honey. Figuratively, to be busy as a bee, you are acting like a busy bumblebee in the way you are constantly moving to get things done.