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1.
Just kidding; don't care.

Primary use: follow-up to a question you have asked when suddenly realizing the answer is inconsequential and/or adds little value to the conversation or your curiosity.

Secondary use: A way to shield against the embarrassment of an unanswered text message or email by taking the offensive-- especially when the question was asked as a desperate attempt to make conversation with an individual of interest.
Person1: At the store trying to find a birthday card
Person2: oh, whose birthday?
Person2: jkdc

Guy: Hey, how was Yoga class last night?
Girl: (no answer)
Guy: jkdc
by decalex October 06, 2013