November.30 NPR Books introduces Emily Dickingson’s poems on leftover envelopes under the title, “Emily Dickinson's Envelope Writings”

> 
> “Readers always seem to want to get closer to Emily Dickinson, the
>  godmother of American poetry. Paging through her poems feels like
>  **burrowing nose-deep** in her 19th century backyard — where "the grass
>  divides as with a comb," as she writes in "A narrow Fellow in the
>  Grass."
> 
> 
> 

As I was interested in the phrase, “burrow nose deep in sth,” I checked both Cambridge and Oxford English dictionary to find whether it’s an idiom or not. Neither of them carries “burrow nose deep” as an idiom.

However, I found some of examples using “burrow (one’s) nose deep:
“If Obama replaces her with an accursed DINO who will **burrow his nose deep** between Bankster cheeks, it will be because that's what he wants to do, not because it's what he has to do. - www.politicsplus.org/.../will-warren-or-a-dino-head-th...‎

“Where do I live if not in your woods? I **burrow nose deep** in dead leaves and silt soil by the river's edge. Your crows march wicked sentinel steps.”- gilliancornwall.blogspot.com

Does “burrow nose-deep” literally mean “dig in / bury deeply,” or have other figurative meanings like intimacy? To me “burrow nose-deep” in episodes of Emily Dickinson and Obama’s replacement of staff appear to be used in different meaning? 

Is it an idiom or simple combination of “burrow” and "nose deep.”?