mooncalf 

pronounced: moon-kaf

1. A misshapen foetus; a monstrosity or freak.
2. a person with a mental handicap; a born fool.
3. a person who gazes at the moon or idles time away; an absent-minded person.
4. An animal imagined to inhabit the moon.

Nerd: You're such a mooncalf!
Jock: Huh?

mooncalf by Non-Cretin June 10, 2005

mooncalf 

A woman with massive cankles.

Plural: mooncalves

The woman was only 21, but her calves and ankles have formed into a giant mooncalf. It'll only get worse as she gets older.

mooncalf by doc md danny June 5, 2020