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What does 玉ヒュン mean?

It seems to have something to do with not experiencing fear of heights.

Context (posted on social media with a picture taken vertiginous height):

> 女だけど玉ヒュン！
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2014-07-04T15:47:04.303
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2014-07-04T16:17:44.617
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meaning
Meaning of 玉ヒュン
It's kind of a crude term, so my answer here will be kind of crude, haha. I
hope that's okay.

Ever heard a guy say, after seeing something like a video of somebody climbing
a tall tower or something, that they felt fear? And that they felt it in their
testicles?  
玉ヒュン basically means that.

玉【たま】 here is a kanji-fied shortening of キンタマ, a colloquialism for 睾丸【こうがん】
(testicles). ヒュン is a sort of sound effect -- like something whizzing past
you. To be honest, I'm not entirely sure how the ヒュン comes into effect here,
but... it makes for something that's kind of fun to say, haha.

Basically what she's saying here is "[I got so scared that] I felt it in my
balls, and I'm a woman!"
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2014-07-04T16:17:44.617
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2014-07-04T16:17:44.617
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