Pound salt jerk off masterbate till you cum. Pound is the action; that cause's ejaculation. Salt refers to the semen; (tastes like egg whites mixed with saltwater).
Pound Salt down a rat hole;means go screw someone in the ass till you ejaculate.
I asked the boss for a raise he told me to go Pound Salt. The second time I asked; he told me to go Pound Salt down Rat hole.