Country Dictionary

The female gluteal fold that shows itself when wearing a pair of fine ass jorts. (Underass equivalent of the underboob).

Yo, me and my bros, Eddie, Wood, and Buddy were opening up a set around Budapest on independence day and popped from 6 to midnight from all the shelf milling about.

Lame

You're so shelf.
So shelf!
Shelve your shelf self.

An ass that utterly defies gravity

<guy1>damn look at the shelf on that one.
<guy2>i know it just... sits up.
<guy1>call schmack we gotta tell him about this one.

to store an arbitrary item in a bodily orifice for later use.

That stripper's son shelfed my phone!

to put something in your ass

When he saw the polices steve decided to shelf his weed

alternate way of taking drugs by inserting them into the anus

hey gareth, i'm going to swallow one pill and shelf the other one

A common photography pose in which a person places their hand beneath their chin, forming a sort of shelf for their head to rest on, in order to better frame their face. When such a pose is used for a selfie, the resulting image is called a "shelfie"

"Excellent use of shelfing, Sasha! What an exquisite shelfie!"