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1.
1) An elf from the Harry Potter series that has to obey its master and do whatever is asked of it. It can only become free if master presents it with clothes. (Some house elves work in the Hogwarts school kitchens.)

2) Someone who listens to everything that his parents tell him to do, even bogus things like ironing a bunch of clothes, vaccuming a car he doesn't drive, fixing vegetables, etc. Some house elves have cell phones that go off at random times, always from the parent asking him to do a task, and because of his house elf nature he is forced to obey.
"Dobby had to obey Lucius Malfoy because he was his house elf"

"Why does Johnny always iron the clothes, vaccum, and fix the vegetables when he could just refuse? He's such a house elf!!"
by Lynese July 30, 2005
 
2.
to clean up after someone else
Can you please put your stuff away? I'm tired of house elfing for you all the time!
by Geoff OMG December 03, 2007
 
3.
A polite word for an African- American or black employee of Carnegie Mellon University that exhibits incompetence, idiocy, and tomfoolery in its purest form.
Fucking house elves.
1: Yo that drunk house elf needed directions.
2: Thank you.
3: No thank you. Never give directions again.
Yo lets have a house elf gangbang.
by Justin Hedge January 22, 2008
 
4.
Someone who obeys people of higher authority without question or concern for what is right or wrong. This person usually hangs around the authority figure trying to please them at any cost.
Look at Johnny over there with Mr. Peterson, what a house elf. I bet he would scrub Mr. Peterson’s underwear if he was asked.
by Steve-a-reno November 18, 2005
 
5.
House Elves are from Britain, but are common wherever Fairy Folk are known to live. Virtually every house has one. They tend to live in broom closets. House Elves are very helpful, unlike pixies and imps which tend to be more tricksey. House Elves will aid in any household tasks. Of course, they are very sneaky and you will probably never see them.
Guy: "That's odd, I don't remember hanging my jacket up..."
Girl: "Must have been the House Elf"
by J. K. November 18, 2005