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1.
Taking a long story and summarizing its main points, skipping over unnecessary details
I wanted to tell you all about my amazing day , but long story short, I totaled your car!!
by .PiCe.NuSSy. September 09, 2008
 
2.
Something a person says halfway through a long, pointless story with trivial details that are interesting to nobody except the storyteller.
(Fifteen minutes of droning blather). Long story short, (fifteen more minutes of rambling digressions.)
by acidnoir July 22, 2010
 
3.
to summarize a longer story (short for to make a long story short)
Yes, but long story short you need to work harder.
by The Return of Light Joker September 14, 2008