Haha, Thanks Sean!
I would need to chat with the sound dude for more specifics, but I believe he recorded himself making a bunch of little sounds, then we basically detected how many syllables were in whatever word the character was saying and played the same number of tiny mouth sounds at random. There might have been some pitch randomization and other post-fx as well.
Yeah, we spent AGES on getting the NO's right! I'm so glad you enjoyed it!