To dream that you are throwing something indicates that there is someone or something that you need to rid yourself of from your life. Consider the object that you are throwing. Alternatively, the dream may be a pun that you are “throwing” or fixing a game or situation. Are you working against the objective?
To dream that someone is throwing something at you implies that there is something that you have overlooked and need to pay closer attention. Perhaps you need to be on the alert for something that is headed your way. Consider how hard the throw is and what is being thrown at your for additional significance. If it was a hard throw, then it means that you may be in for a surprise.