Letting out A LOT of air?

[Eric Alan]

It does not sound like hissing I know they do that and I know what it sounds like.
This just sound like he is blowing out a lot of air like he is sighing or its forced.

That's basically the sound I'm referring to. Kind of like an "I'm annoyed and I'm going to let you know, but I'm not annoyed enough to really do anything about it right now" sound. It's different than a warning hiss, but still I'd call it a hiss.