Top definition
When a dog's jowls gets caught on its tooth forming a small bubble-like shape.
Child 1: "Awe, man, Look at Sterling's Juby Loon. He looks hilarious!"

Child 2: "Haha! Yeah, my dog gets that too after he yawns or eats."

Child 1: "Stfu."
by Myce February 09, 2011
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