J –JOINT EATER
Sorry folks, there wasn't much information to be found about this guy. But here goes...
This is a creature is a type of fairy from Celtic and Irish mythology. Another name for it is alp-luachra. It can be male or female. There are two ways it exists, either inside the body of the victim, much like a tapeworm, where it will consume most of what is eaten by the person, or it will sit beside the person while their eating and take their food.
In a story by Douglas Hyde, Beside the Fire, dated in 1890, he told of a man who had 13 of the creatures inside of him. He was directed to eat large amounts of salt beef and not drink. Next he was told to lie down above a stream with his mouth open so the fairies would jump out and drink the water.
The above information was found here.