You're right that the problem is not with the moocher who is living off you.
From the psychcentral.com
Most of you who wrote in found fault with the parent, not the kid moocher.
From the washingtonpost.com
Maybe you will grow a Skill and Independence and quit being a moocher.
From the eatocracy.cnn.com
As I lit one of these poisonous cylinders, the inevitable moocher hit me for a free smoke.
From the theatlantic.com
The first time Romney held forth on America's moocher class, video captured the moment.
From the latimes.com
I do not view myself as a moocher or taker of anybody's money.
From the economist.com
In their eyes, a guy moving into MY place is a moocher.
From the freep.com
Yes, my dad was once an aimless food-moocher with a wolf-man beard whose own grandmother didn't recognize him.
From the evangelicaloutpost.com
You are a moocher, a zombie, soulless, mouth-breathing, ignorant, greedy, self-indulgent, envious, shallow and lazy.
From the freep.com
More examples
Someone who mooches or cadges (tries to get something free)
(Moochers (film)) Moochers, hosted by Brett Butler, was a reality based television project about people who try to get relatives and friends who have overstayed their welcome to move out and live on their own. The project was filmed in California and Texas.
A person having a tendency to repeatedly ask help of others, especially if they are making little effort to help themselves. Usually used as a pejorative
Someone who will smoke your bud in a second, but never has any of their own.
A person who begs for things; a person who mooches.
This is a sub-category under "looter," with the main difference being that the moocher just waits for the looter to give him what he needs, in return for his vote to keep the looter in power. The looter is the one who steals it from the producer.
A vagrant or petty thief scavenging food or other items, some for personal use and the rest for sale.