The Collaborative International Dictionary of English v.0.48:

Sporting \Sport"ing\, a.
   Of, pertaining to, or engaging in, sport or sports;
   exhibiting the character or conduct of one who, or that
   which, sports.
   [1913 Webster]

   Sporting book, a book containing a record of bets, gambling
      operations, and the like. --C. Kingsley.

   Sporting house, a house frequented by sportsmen, gamblers,
      and the like.

   Sporting man, one who practices field sports; also, a horse
      racer, a pugilist, a gambler, or the like.

   Sporting plant (Bot.), a plant in which a single bud or
      offset suddenly assumes a new, and sometimes very
      different, character from that of the rest of the plant.
      --Darwin.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sporting man
    n 1: someone who leads a merry existence; especially a gambler
         on the outcome of sporting events
    2: someone who enjoys outdoor activities [syn: sporting man,
       outdoor man]