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A phrase added after any adjective to make it stronger.

Perhaps started by people trying to be less vulgar than using "as fuck" or "as shit", but still wanting to use a dirty word.

The resulting phrase doesn't have to have anything to do with testicles or their qualities; it's almost better when it's very un-ball-like, because it makes other people stop and think how your phrase doesn't make sense.
I'm hungry as balls!
Dude, your mom is hot as balls.
I was sick as balls last night.
It's cold as balls out here!
It's cold as balls are not!
by Coell June 12, 2006
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3
To an extreme degree, especially with regard to temperature. Likely derives from the phrase "cold enough to freeze the balls off a brass monkey," which itself dates back to the 19th century.
by swiftlamb January 07, 2015
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