DuckCorp Dico

Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   [Walkup]
   
   ** English
   
   *** Etymology
   From [en].
   
   *** Noun
   [en-noun]
   
    1. [en] .
    2. * {{ quote-journal | en | date=February 26, 2009 | author=Audrey Tempelsman | title=Indian Modern Redux | work=New York Times | url=http://www.nytimes.com/2009/02/26/garden/26namita.html
   |passage=The apartment is in the Flowerbox Building, a new doorman condominium
   on East Seventh Street named after the built-in, self-watering flower boxes
   that stand in contrast to the street’s dingier tenement WALKUPS.}}