Someone slow, dimwitted or stupid - another way of saying "Not the sharpest knife in the drawer". Also, someone who stands out in a crowd as being particularly unintelligent.
Marisa: Why does Ericeven bother talking in class - he has no idea what he's talking about.
Michael: What do you expect? I mean he's not the brightest bulb in the chandelier!
Chanelle is a cool girl who loves making people laugh. Although Chanelle gets along with just about everyone, she only has a couple of true friends. She is also smart, cute and always happy. When it comes to boys she is timid very shy,and not really herself until she really gets to know him. But she makes a laid back girl. Chanelle can fit into about any social group. She hates seeing sloppy people.