One who takes all of the appetizer plates that a waitress will put on a table without thinking of the other people at the table. Usually, the plate hog will just eat off of the top plate, leaving the rest of the stack intact.
In sports (both real and fantasy) a player with a high salary that underachieves or performs below expectations. This player ties up a considerable amount of salary under the salary cap, hence the name cap hog.
"Smith is only scoring 3 points a game. We need to get rid of him, he is just a cap hog at this point."
"I need to get Johnson off of my team, he is just a cap hog at this point."
When someone hogs all the coffee not long after a new pot was brewed,thus being a caffeniation hog. Caf hog for short.
person 1:"What happened to all the coffee?"
person 2:"Greg showed up with his travel mug and filled it up
person 1:"What a caf hog"
person 2:"Really. He doesn't even have a job, he's not traveling anywhere."