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This article contains information that originated from an unlicensed Star Wars Legends source.
This article's subject originated in a source that was released outside of the Lucas Licensing process, and its licensing status was never confirmed by Lucasfilm Ltd.
Sybrial brain slugs, presumably from a planet, system, or sector named Sybria (though this is not confirmed), were often used to describe someone who had just uttered a particularly stupid comment by saying something like "You Sybrial brain slug!"