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
Now is widely used to refer to all women of similar ages and not just girlfriends.