In informal slang usage, to "spout" means to talk continuously, rapidly, and often pompously or authoritatively about a subject without pausing, similar to a geyser forcefully ejecting water. Additionally, in specific historical or regional colloquialisms, phrases like "up the spout" are used in slang to describe financial ruin, items lost to a pawnshop, or plans that have gone completely wrong and failed beyond any possibility of recovery.
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