It is thought that the game arose in the middle ages when bored soldiers took to hurling arrows at the upturned covers of wine barrels, perhaps seeing who could come closest to the cork bung.
The shortened form of arrow became the dart, and a slice of tree trunk the target. [1]
If you are throwing darts at someone, then this represents resentment, blame, or jealousy.
If someone is throwing darts at you, then this reflects unresolved shame or guilt. Remember that which you put out comes back to you ten times.