what is the job of a walmart overnight grocery stocker?

To clear as many pallets of product, safely, accurately, neatly, and quickly to the appropriate gondolas as possibly.

[quote] Job Description and Duties

An entry-level job title, the position of Walmart stock associate involves moderate-to-heavy labor. Primary job duties may include loading and unloading shipments, organizing backroom spaces, constructing displays, and stocking shelves. Walmart stock associates must possess the ability to lift heavy objects in excess of 50 pounds. Knowledge of operating heavy machinery such as forklifts may also prove necessary. Only applicants 16 and older may apply for Walmart stock associate jobs. Walmart generally trains stock associates using verbal and visual orientation as well as hands-on demonstration.

You restock groceries onto the shelves during the overnight shift. I think that's a pretty good guess since I don't work at Wal-Mart.

Stocking groceries at night - ie. putting things on the shelves ready for when the shop opens in the morning.

You come in at night and stock the shelves.

you STOCK the grocery shelves