The condition where a person chews with their mouth open. Most people grow out of this condition when they leave childhood. Some adults, however, never learn to close their mouths when they chew. As a result when eating they produce disgusting noises, allow people around them to see food being chewed inside their mouth, and can inadvertently spit out flecks of partially eaten food. People with a disability or who have something that impairs their ability to close their mouth when chewing do not suffer from this condition.
It's awful hearing him eat because he suffers from a chronic case of lazymouthia.

Her lazymouthia is why we didn't invite her to join us for dinner.
That man clearly has no idea that his lazymouthia is annoying everybody sat around him.
by Tod Daniels March 6, 2017
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