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1.
When the temperature outside causes your balls to sweat, this also applies to female "balls".
"I cant come outside and play", said Jessie, "I'll be sweating balls!"
by Kerry L. August 04, 2005
 
2.
When its so hot outside the sweat droplets on your head are as big as balls.
Its 101 degrees and im sweating balls.
by Aaronnyc89 April 11, 2007