A fork of Rural Dictionary
When a large obese person lays down on the ground, they become big back mountain
Look at that bigback mountain there on the beach
When you eat copious amounts of food to the point of embarrassment and feeling like one has an enormous back due to downing that much foo9d
Joy was bigbacking when she ordered a whole pizza while in line for In-N-Out and followed through by eating all of it in one night.