A person so large and/or fat that when you are close to them, you think of them less as an individual and more as a dangerous obstacle. Concerns include being crushed, knocked over, sat on, suffocated, etc.
On the way up, this huge landmonster got in and we were all squeezed up against the walls. I thought she was going to break the elevator.
My freind Ethan, who has become "emo" in out look in life and dress, is a Fagmonster. He absorbs other people's gay, and sends it out as his own, giving off homosexual vibes for miles from his hill billy house.