This is the 1533rd most frequent Turkish word.
havadan
"From the air" or "through the air."
The word 'havadan' ('from the air') is used here to describe the origin or source of the sounds.
Havadan gelen sesler çok garipti.
The sounds coming from the air were very strange.
In this usage, 'havadan' ('out of nowhere') figuratively expresses the unexpected origin of the idea.
Bu fikir havadan geldi.
This idea came out of nowhere.
Here, 'havadan sudan' ('about air and water') is an idiomatic expression meaning discussing unimportant or trivial topics.