Chubnugget

A word that refers to something that is chubby and cute, usually a human infant.

Wow, that baby's such a chubnugget!
I know, right! So cute and chubby!

Smooth brain

Smooth brain is an insult that refers to an unintelligent person. Supposedly, the intricacy of one's knowledge is represented by the wrinkles on their brain. If their brain is smooth and lacks wrinkles, their knowledge lacks intricacy, and they are therefore stupid.

What a smooth brain that person is.