Webster's English Dictionary

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joker

jok.er \'jo--k*r\ n 1a: a person given to joking  1b: FELLOW  2a: a playing 
   card added to a pack as a wild card or as the highest-ranking  card 2b1: an 
   ambiguous or apparently immaterial clause inserted in a legislative  bill 
   to make it inoperative or uncertain in some respect 2b2: an unsuspected, 
   misleading, or misunderstood clause, phrase, or word i n a document that 
   nullifies or greatly alters it 2c: something held in reserve to gain an end 
   or escape from a predicament  2d: an unsuspected or not readily apparent 
   fact, factor, or condition that  thwarts or nullifies a seeming advantage