Junjo

/joonjo/
Adjective & Noun

A multi purpose word that describes a living creature who appears to be defective.

It can also act as a title for someone who acts in a way that could be described as "absurdly retarded".

You see your new born baby for the first time and it looks well truly retarded.
"Oh no, the baby is junjo!!"

Someone walks into the room and says something ridiculously stupid.
"I didn't know he was a junjo."