Top Definition
A lucid synonym for the function and after-effects of testicular perspiration. The term ball vapour should specifically refer to the visual phenomenon of steam rising from a set of sweaty testicles - typically within a climate much cooler than the average ballsack. Ball vapour is less common in countries that experience year-round warmth or extensive home central-heating systems. Northern European countries such as Norway, Sweden and Scotland have been epicentres of the ball-vapour phenomenon for many years.
Ball vapour swirled through the air as my sweaty nuts glistened in the winter moonlight.
by Gaberdeen February 03, 2010

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