Source : Webster's Revised Unabridged Dictionary (1913)

Bock beer \Bock" beer`\ [G. bockbier; bock a buck + bier beer;
   -- said to be so named from its tendency to cause the drinker
   to caper like a goat.]
   A strong beer, originally made in Bavaria. [Also written
   {buck beer}.]

Source : WordNet®

bock beer
     n : a very strong lager traditionally brewed in the fall and
         aged through the winter for consumption in the spring
         [syn: {bock}]