Answers: I don't know for sure, but I always wondered like thing. I can't believe I am admitting this, but one day I be really bored, so I did the little puff thing close to my (normally very friendly ) cats face, and he lift his entire front arm up in the air, I'm talking waaay up surrounded by the air, like a human, and then he smacked me so concrete across the face , I couldn't believe it. He was soooooo mad, I in fact burst out laughing.
Apparently the chuffing thing is not a sign of greeting between a human and a cat. At least not between my cat and me.