A person who is a freeloading is a person who is basically using you -- most often for a place to live/room and board: a place to stay permanetly if they can or just to crash if necessary; a free meal ticket; drugs; clothing; transportation; entertainment, and money-- basically whatever they can get their greedy lil paws on. If at some point you become obsolte or unusable to the freeloader they will usally find another host body (usually a wealthier one) to feed off of. Freeloading requires one to be extrememly manipulative and kniving.
person 1 : I wanted to help my friend M out and invited her to stay with me for a while but she ended up freeloading off of me and sucking me dry of all my recorcources (as stated above); eventually I had to kick her freeloading ass out. She eventually even found a job but still didn't make any attempt at restitution, which is common among freeloaders.
person 2: freeloading is the lowest form of any of these other forms: couch surfers, phrogs, sqatters etc.. because they are usually friends who knowingly betray your trust and are usually just in it to use you. Freeloaders are basically just users at heart and people should be careful of letting freeloaders into their homes, because once they are in they do NOT like to leave.