Taking the Name in Vain

The third command is “Do not take the name of Yahweh your God in vain.”

Somehow that command has been reduced to the prohibition of saying, “God d—n” or “Jesus Christ” when one is upset or unhappy.

But if the name of God is Yahweh, if the Hebrew word for God is Elohim, and if the name Jesus would not be given for thousands of years—could that really be the intention of Yahweh by this third command?

What does it really mean to take the name of God in vain?