'Slugger' definitions:

Definition of 'slugger'

From: WordNet
noun
(baseball) a ballplayer who is batting [syn: batter, hitter, slugger, batsman]
noun
A boxer noted for an ability to deliver hard punches [syn: slugger, slogger]

Definition of 'Slugger'

From: GCIDE
  • Slugger \Slug"ger\, n. One who strikes heavy blows; hence, a boxer; a prize fighter. [Cant or Slang] [1913 Webster] [1913 Webster]