Top Definition
Combination of the terms NBN and MILF which describes a mythical realm dripping with perpetually horny drop-dead gorgeous women between the ages of 35-50. Some upper-middle-class planned suburban communities bursting at the seams with trophy wives may qualify, but most of us will only see them on TV or in the movies.
Fairview from Desperate Housewives may be the mythical Land of Nibbenmilf.
by The Evil Steve July 29, 2005

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