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For one to spill one's guts is to make a babbling and unconcise statement or speech that is so diluted with bullshit/assfacts/nonsense that it resembles non-projectile vomit:- the infectious material or foreign body is dismissed along with plenty of internal material that is not wanted.
Don't spill your guts on the best man's speech like you did at the rehearsal, and don't get drunk until you've made it.
by Kung-Fu Jesus April 28, 2004