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Ironic, negative or surprising consequence/fact or Catch-22. Unexpected result.

Usually follows a positive statement. Used as bridging statement for dramatic effect, to a negative consequence/statement.

Probably stems from the phrase "you'll be kicking yourself for this one"
Sure, renting an apartment is cheaper and gives you a lot of flexibility to move around, but here's the kicker: with the money threw away renting places for 5-10 years you could have been well into a mortgage and have built up some personal equity, and credit.
by satan November 09, 2003
to flail one's distal appendages in a spastic display of frustration and helplessness. often follows the consumption of (relatively) large quantities of liquor or malt beverages
Watch her do "the Kicker." I hope she doesn't knock over my aquarium.
by Bartleby the Scrivenahhhh February 24, 2009