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Belching is the act of making a burp. It is letting air out of the stomach through the mouth. Burping is caused by air being trapped in the stomach. "Esophageal speech" is the act of "burping" words.
- Kent, Raymond D. (2004). The MIT Encyclopedia of Communication Disorders. MIT Press. p. 138. ISBN 0262112787. http://books.google.com/books?id=mPIhN13uHJcC. "A laryngectomized person may be able to learn to use esophageal voice, also known as esophageal speech. For this method, commonly known as 'burp speech,' the person learns to use the esophagus (food tube) to produce voice."