1. A person devoid of any redeeming characteristics.
2. Someone who consumes valuable resources without contributing anything to society. A bum. A drain on the economy.
2. Having the qualities of the above.
1. That fat bastard is a goddam wast of space 2. Grad students are such a waste of space 3. I spent the day napping instead of cleaning. I'm just a waste of space.
Someone who is so worthless that the planet as a whole would be better off if he/she was dead, because he/she is consuming food that could go to the starving of Africa.