Usually a homeless & jobless lazy male or female who is a total moocher and who eats all of your food and often steals from the victim who the couch munster decides to attach it's self to. It's almost impossible to remove this beast unless you bribe them with drugs,alcohol or food. They refuse to leave without being kicked out on their ass.
This person loves to hog the TV and your videO games....
They are most often junkies....trust me i know.
Though other addicts and losers and pigglet leaches of all sorts can become a couch munster/parasite. If you can bribe them then set the couch on fire as they sleep/