The phrase derives from the behaviour of bees. When a forager bee finds a source of nectar it returns to the hive and communicates its location to the other bees, using a display called the Waggle Dance. The other bees are then able to fly directly to the source of the nectar, i.e. ‘make a beeline’ for it. This dance is a surprisingly sophisticated means of communication for a creature with such a small brain. The forager bee performs a short wiggling run – hence the name, with the angle denoting the direction of the nectar-laden flowers and the length of time denoting the distance.