All this time I've been thinking people just had a typo when they said bettercreme...what the heck is it?!

its a product that is put out by Riches. It is a light a fluffy type icing that the grocery stores often use. It come frozen in a quart container, and you just whip it in the mixer.

so does it crust, is it something people use on the outside of cakes then decoratations on top?

It doesn't crust. And people use it in all sorts of ways. But yes it can be used to ice the outside of the cake. My limited experience with it, is that i use it to make fruit mousse type fillings that are shelf stable. I either just mix jam in to the whipped icing or mix the sleeve fillings in.

It doesn't crust as much as it "films." It's not something you can smooth with a Viva. To me, the texture and taste are identical to Cool Whip. It just doesn't have to be refrigerated, which is why people like to use it for fillings. I have used it for fillings and I iced a cake with it once. I definitely didn't prefer that over a regular buttercream. It all depends on what you like.