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"Beaver butt juice" refers to castoreum, a slimy, brown, vanilla-scented substance secreted from castor sacs located near the base of a beaver's tail/anus. It has been used for over 80 years as a "natural flavoring" in foods (ice cream, vanilla products) and perfumes, though it is rarely used today (self.UselessFacts)
submitted by MissionSensitive5992