Cookie ears

We delivered frozen cookies to the neighbor just now. They were ordered last month in yafr (yet another fundraiser).
The neighbor likely forgot she had ordered them and asked

Did I already pay for these?
Yes.
Okay. I just ordered some more from my grandson!
(now addressing the girls in that singsong kid voice)
We are going to have cookies coming out of our ears!

A momentary somewhat uncomfortable silence followed while the girls parsed this strange sounding idiom.

The Wee Mermaid broke the silence with a nervous giggle and said

Well, our ears aren’t like that