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1. An iguanodon is a prehistoric dinosaur known for it's sharp thumbs.
2. An iguanodon is when you take either of your thumbs and stick it into your friend's neck. If blood comes out, you did it wrong.
1. "And now we're moving on the bones of an iguanodon, it was known for it's incredibly sharp thumbs."

2. Son: "Mom, some kid stuck his thumbs into my neck"

Mom: "Dont be such a pussy it was just an iguanodon."
by GhengisK June 25, 2010
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