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An expression used when something is really cool or awesome.
Guy 1: Dude, I had sex with this really hot chick last night.
Guy 2: Balls tight!
by brrutled July 1, 2011
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When cool air hits your junk. The automatic body reaction is to try to keep your balls warm. Keep your swimmers from dieing. So the scrotum skin around them contracts.

This reaction happens on other occations to.

For example
Your ex. Girlfriends voice can send your balls running!
balls scrotum cold ex tight ball sack tight sack
by Solo_device86 February 15, 2017
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