An individual who is so stupid, ignorant and inept that their breathing and existence in any environment or location should be considered a crime due to their inhalation of oxygen that would be better utilized by others.
I can't believe that Mike was promoted. He is the biggest oxygen thief in the office.
One who leeches off other people, scrounges off their parents, annoys everyone they come into contact with, refuses to work, stays in bed until mid afternoon most days and wastes what money they do have on gambling machines and often has a lazy eye. Otherwise known as a parasite
A living human who continues to waste valuable oxygen that many feel would be best preserved for other uses. The oxygen is predominantly wasted through the beings ineffective contribution to society leading many to question their existence on the planet.
"Jim, who is this big-titted mongloid on the front on the newspaper?"
"Bob, Thats Katie Price, she is the biggest oxygen thief known to man"