Source : Webster's Revised Unabridged Dictionary (1913)

Goose egg \Goose egg\
   In games, a zero; a score or record of naught; -- so named in
   allusion to the egglike outline of the zero sign 0. Called
   also {duck egg}. [Slang]

Source : WordNet®

goose egg
     n : a quantity of no importance; "it looked like nothing I had
         ever seen before"; "reduced to nil all the work we had
         done"; "we racked up a pathetic goose egg"; "it was all
         for naught"; "I didn't hear zilch about it" [syn: {nothing},
          {nil}, {nix}, {nada}, {null}, {aught}, {cipher}, {cypher},
          {naught}, {zero}, {zilch}, {zip}]