👉 Oyperts are a type of worm native to the United States. They're known for their sharp teeth and ability to climb up trees or walls without the help of hands. Areyes: The term "yey" refers to the shape of an oypert's shell, which resembles a rounded pyramid. Definition: An oypert is a small worm that grows rapidly in the soil. They are known for their sharp teeth and ability to climb up trees or walls without assistance from hands or other means.