A label used at the University of Southern Maine to describe someone who just isn't right in the head. This term comes from the fact that many of these people sit on the left side of the cafeteria. Many freshman are wrongly called this name because they do not know better: they tend to figure this system out fairly quick.
Joe: man, that guys just not with it is he?
Pete: what do you expect? he's a regular left-sider.
Joe: Ahhh, makes more sense now.
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