Cushion in a bass' sound: What does it mean?

So we all have ways we describe our favorite sounds coming out of the double bass: that a bass "moves air", "sounds chocolatey", "makes my teeth rattle", or sounds "buttery" are some of my favorites, and they are all attached to other sensations - taste, feel, etc. - but the most elusive, ambiguous adjective (IMO) is a bass' "cushion".

I'm curious, what exactly do YOU mean when you say "this bass has a lot of cushion"?

 

Hahaha. It's been a while. Maybe I'll have to rewatch it so that I can finish the sentence "The bigger the cushion..."

 

Anonymatt, that's really interesting. I think of cushion when it comes to the sound of a bass itself, not necessarily how it's played (though you can bring out the cushion it with technique).