Irish phrase to describe an ugly person usually, os else just a friendly insult. (Mistake Of God)

Half man, half dog. He's his own best friend.

Acronym for the mother of the groom in a wedding (Mother of Groom)

A role playing character in Final Fantasy 6 whose name was used incorrectly to define his species.
"Mog" in actuality, is the name of a notable and heroic "moogle" who helped the heroes fight Kefka from destroying the entire world.
Perhaps both the term "Mog" and "moogle" were mixed up in the first place may be the result from the lack of knowledge noobs have about the game.

A sound you make when you don't want to go to work

someone who is completely self-absorbed, one who will only fall in love with themselves, someone who is a legend in their own mind and stars in their own movie of life. one who is rude only because they are envious of the actions and successes of others, someone who lacks many friends, other than themselves.

To masturbate and jog at the same time.