Anything used to describe someone who lacks sense of life, looks dumbfounded, and has only a limited ability to learn and understand. Often excluded from society.

A friend who 1) tells you there are hot chicks at a party (and he actually thinks they are hot) but in fact they are fuglies or 2) a friend who proclaims there will be tons of girls at his party and there are not many at all. (Ironically, his mortness might still be revealed when the few girls that are there actually weigh a few tons)

An unintelligent dimwitted individual who lives
(or should live) in the suburb location of Mortdale, NSW, Australia.

A creepy mouse-lemur that looks like a rat and is crazy and low in intelligence.

an annoying/stupid person. Orginally used to describe a white person who fits the criteria.

Short for mormon. Used among black people to insult anybody.

used by black people because mormons are racists sons of bitches. anyone can use it though.

1. (noun) A degenerate; one who is unproductive, lazy
2. (noun) An individual with a lack of intelligence.
3. (adj) defeated, lifeless, usually as a result of dire circumstances.

Girl.Girl friend.
Think it may have originated during Napoleonic wars. 'Mort' as in death as in slang for catching syphilis from a female.