stock blocking

This happens when another customer or a store employee leaves their cart in front of the product, or "stock" shelf that you need something from. Some grocery stores "stock block" themselves by setting up a temporary display in front of other items.

It sucks when you're in a rush to get some things from the store on your way home from work, and the aisles are full of people and their giant shopping carts, packed high and full, stock blocking the few things you came to pick up!