An inmate who befriends a fellow prisoner, performing the duties normally expected of a wife (yes, that as well). This is normally in exchange for protection or just to avoid being passed around the other prisoners like a box of chocolates.
‘Wives’ must defer to their men. They are expected to do domestic work, for instance keeping the cell tidy and making their ‘man’ tea. Most importantly, they are expected to be constantly available to their ‘husbands’ for sex.