pound sand in your ass
A kind way of telling someone to fuck off, through insertion of sand into their anus, and pushing it down through the use of a stick, road cone, or broken broom handle.
guy 1- man this dude at the bar was being a total douch nozzle.
guy 2- so what did you do?
guy 1- I just told him to pound sand in your ass.
guy 2- hmmm.