A human being with an ass that takes up the whole aisle at walmart.
Also has many dynamic features to it.

when you're hungover as shit after a spending a night drunk as a skunk

A woman with a shelf like rear end known to shop at walmart.

When you can't make it to the mall where the hot chicks hang out, you are relegated to Wal Mart. Where you check out the lower grade, but sometimes fine pieces of ass that are shopping there.

Wide hips but that ass is flat as fuck