heavy gravity pocket 

An imaginary patch of strong gravitational pull that causes a person walking home to deviate suddenly from their path and collide with stationary objects such as trees, electricity poles, walls or even roads. Usually associated with excessive alcoholic intake. Generally a heavy gravity pocket is a late evening phenomenon that frequently leads to an Unexplained/Unidentified Drinking Injury (UDI).

"What happened to your leg?"

"I was walking home from the pub and whoooa — I suddenly hit this heavy gravity pocket. It came out of nowhere."

heavy gravity pocket by Botosafado February 18, 2008