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A skinny boy who works out constantly but doesn't get results, so he begins to flex 24/7 in order to appear buff and muscular. Flex Boys usually think they are very handsome and have a tendency to look at themselves in the mirror whenever they have the chance. Never become a flex boy, try to get results through working hard instead.
- "Oh my god, why is Cristobal flexing all the time?"
- " He must be a Flex Boy."
by fermontenegro16 April 02, 2015
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