The stomach was an organ used for digesting food. The sarlacc took a millennium to digest its victims, an agonizing execution that Jabba the Hutt planned to subject Luke Skywalker, Han Solo, and Chewbacca to.
Later on Endor, Han admonished Chewbacca for thinking with his stomach after he pulled a carcass and got them caught in an Ewok booby trap.
StarWars.com clarifies that the Millennium Falcon was in the gullet of the space slug, not its stomach.
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