The word "aaah" is an exclamation often used when someone is feeling relieved, comforted, or experiencing pleasure. It is a short and simple way to express a positive feeling or a sense of calm. Full definition
You'd pop by... oooh and aaah at lovely photos of my cats, and rocks on the beach, and I'd lazily sit here basking in your praise. (acolourfulcanvas.com)
My daughter knows all about growing things, oohs and aaahs over all the pretty produce at the farmers market — and won't eat any veggies except frozen corn. (rookiemoms.com)
He said he ummed and aaahed about whether to offer help, but he did offer his help. (semanticallydriven.com)