chump

Generally, a person who lacks common sense, street smarts and a sense of self. A slow witted person. One who does not know the ways of the world. One who does not know their ass from a hole in the ground. Easily manipulated & taken advantage of. Usually operates in a field that is way above their skill-level. Incompetent. An embarrassment. Essentially a tool; a useful idiot. The chump usually thinks he is cool and suffers from over-confidence; but is just a player and is being fooled before s/he knows it.