an act similar to sodomy but without the crap, only performable on posessors of a vigina. Position and intent however remain the same. Also sometimes refered to as a "grudge fuck".
When your woman won't get out of bed and thinks that lying on her stomach is a safe position. Threatening to sodomize her won't work because you just "can't go there" instead you threaten to "vagimize" her, to get her moving.