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To "flex" is a slang - meaning to strut, or physically show off something - usually the body. "Flex in on your ex" suggests that whoever this is said about intends to do this to you ex partner (e.g. I am going to flex in on your ex, he is going to flex in on your ex, she is..., they are..., etc). Basically - that the person who is going to flex is going to make a move on your ex.

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15y ago

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