D defs.my
Entry 3 senses Webster, 1913

Kicker

· Kick·er · IPA /ˈkɪkɚ/
01 n. One who, or that which, kicks.
  1. 1.
    One who, or that which, kicks.
  2. 2.
    A fact, condition, or circumstance, sometimes concealed or not obvious, which reduces or eliminates the benefit of an apparently advantageous situation; a joker{5}; 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]
  3. 3.
    An unforeseen added expense or additional cost; as, the printer was cheap, but the special paper it needed was an expensive kicker.