It sounds like a rubber bushing is gone. When you picked up the car it allowed the weight to come off the bushing and it moved from the position it was in. Just a little, but that was enough.

A quick repair from the old days was to fill up an oil can with brake fluid and hose down all the rubber bushings. If the noise stopped you may not know which bushing it was but you knew it was a bushing.

Today I guess you could use WD-40 so you could skip the oil can. It would also make it easier for the lube media to get down into the bushing.

This is not a repair, it is just a good way to test for a bushing noise.

Also, take a look at your strut. If the cartrage, the shock that is, is oily looking then you will need to replace it. They can make a lot of noise when they go out.

Pooka