"The Zone" is a Jeffism and short for "the boyfriend zone". According to Jeff it is the period immediately after a break up where the relationship isn't completely over as you might still have belongings at your girlfriend's flat, still have invites as a couple to events (such as a wedding) and are still under joint headings in friend's address book. As such the boyfriend is still entitled to the intimate perks of the old relationship.

Jeff explained this concept to Steve as Steve is going to dump Jane and that Steve is "...entitled to (Jane's) stockings."

Jeff later crowns Steve the King of the Zone after he asks Susan out on a date whilst having sex with Jane. ("Flushed")