DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   plum
       adv 1: exactly; "fell plumb in the middle of the puddle" [syn:
              plumb, plum]
       2: completely; used as intensifiers; "clean forgot the
          appointment"; "I'm plumb (or plum) tuckered out" [syn:
          clean, plumb, plum]
       n 1: any of several trees producing edible oval fruit having a
            smooth skin and a single hard stone [syn: plum, plum
    tree]
       2: any of numerous varieties of small to medium-sized round or
          oval fruit having a smooth skin and a single pit
       3: a highly desirable position or assignment; "a political plum"