The pulp remaining after extraction of juice from sugar cane or similar plants.
Bagasse is used as a source of cellulose for paper products, and is also used as fuel. According to Wikipedia, bagasse is often the primary fuel source for sugar cane mills. And, bagasse is sometimes added to food as "sugar cane fiber".
Paper made from bagasse fibers is called 'megasse'.
The term originally referred to the debris left over after pressing olives, grapes, etc.; in modern use it mainly refers to sugar cane pulp, or sometimes sisal (agave) pulp.
The below pic is from Feedipedia.
Etymology: from Spanish bagazo, dregs.