I don't even like grapefruit but what an absolute unit. (That is not a small avocado.)pic.twitter.com/uGZwFXgqCN
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'Flex ' meaning 'ostentatiously demonstrate one's power with regard to ... '. The metaphorical relationship to 'flexing your muscle' is clear. From my googling, seems like rappers were using 'flex' without the reference to muscles for years. I still suspect a Caribbean lineage.
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