A person with no common sense, really dumb. or a person that you think is stupid being the way they look or act. it can also be used as an insult. someone that would remind you of an actual dump truck(big slow dumb and ugly)
When you come out of the bathroom after a huge greasy shit and then titty fuck a women thereby leaving a trail of slimy shit on her stomach. This is an excellent way to end a relationship.