The Collaborative International Dictionary of English v.0.48:

Limburg cheese \Lim"burg cheese\, Limburger \Lim"burg*er\, n.,
Limburger cheese \Lim"burg*er cheese\n.
   A soft cheese made in the Belgian province of Limburg
   (Limbourg), and usually not eaten until the curing has
   developed a peculiar and, to most people, unpleasant odor.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Limburger
    n 1: a soft white cheese with a very strong pungent odor and
         flavor