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When one is attempting to engage in sexual intercourse with a female and said female uses her vaginal muscles to shut the opening detering one's attempt in any sexual act involving the vagina rendering the male participant "flex zoned"
Jon: I was hooking up with this girl and I couldn't get my finger in and then she told my whole band about it, it was embarrassing.

Chat: Yo, you got flex zoned!
by Narwhal Nation September 01, 2014
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