A narrow shelf-like area, usually located in the dashboard of older vehicles, that is perfectly suited to hold something the size and shape of a burrito and little else, such as the 1992 Chevrolet S-10 Tahoe.
Passenger: "Dude, where can I put these drumsticks?"
Driver: "Stick them in the burritoshelf."
When a girl is bent over on all fours and your looking from behing. You have two options. The bottom shelf (pussy) and the top shelf (asshole). And the top shelf is always harder to get, thus why its better.