Mot

[Mark Zuckerberg]

Mot is an Irish slang word for girlfriend.

The word originates in from the Irish maith which means good. Caillín maith meaning good girl became a way of refering to your girl friend.

Over the years the word changed so it was simply mot, which became used by lower class Dubliners.
Now is widely used to refer to all women of similar ages and not just girlfriends.