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A person with inferior skill. The origin is from the online game Conquer Club. The game uses a military ranking system, the lowest being a chef. The symbol is a chef's hat. The phrase has spread to everyday usage in describing unskilled people.
Aaron: I was talking with this chef hat client today who was asking for the standard deviation of a single data point.

Travis: Wow, that's pretty dumb.
by It's-a Me, Aaron! April 18, 2011