Buccal speech is an alaryngeal form of vocalization which uses the inner cheek to produce sound rather than the larynx.
Both the air chamber and the replacement glottis are formed between the cheek and upper jaw.
Buccal speech is produced when a person creates an air-bubble between the cheek and the jaw on one side and then uses muscular action to drive the air through a small gap between or behind the teeth into the mouth.
[1][2] The speech sounds made in this way are difficult to hear and have a raised pitch.
The technique can also be used to sing,[1] and is usually acquired as a taught or self-learned skill and used for entertainment.