A person who lives on your couch for free. They don't pay Rent, Eat all your food, Take up all the time on your XBox and Smoke all your weed. They don't move all day, try to get a job or be productive at all.
A Lazy Ass Person living on your couch.
As you walk from your bedroom to the kitchen, you see your friend who has been at your crib all weekend...
"Look at this Couch Nigga"