DuckCorp Dico

Found one definition

1.                 From English - Polish Piotrowski+Saloni/FreeDict dictionary ver. 0.2:
                   
   
   
                   
                     
   grass /grɑ:s/
   I.  <N> 1.  trawa
    2.  [nieform]  marihuana
   II.  <N Comp>grass roots /ˌgrɑ:s ˈru:ts/   doły partyjne, doły, baza, podstawa