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From The Collaborative International Dictionary of English v.0.48:
Kicker \Kick"er\, n. 1. One who, or that which, kicks. [1913 Webster] 2. A fact, condition, or circumstance, sometimes concealed or not obvious, which reduces or eliminates the benefit of an apparently advantageous situation; a joker; as, under the Soviet system, bread was good and cheap, but the kicker was that you waited in line for hours to get any, if it was available. [informal] [PJC] 3. Hence: An unforeseen added expense or additional cost; as, the printer was cheap, but the special paper it needed was an expensive kicker. [PJC]