When the mercury rises and the humidity peaks, a frequently resulting condition is known as summer sack. The condition can be characterized by temporary ball sack adhesion to the upper thigh, general saturation in perspiration, and a resulting mysterious funk. Similar to swamp nuts in the tropics and American south.
Friend: I have got some serious swas going.

Friend 2: Yeah, I've got summer sack for sure.
by gordonblue August 22, 2007
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1. hot, sweaty, saggy testicles.
2. a bag used in the summer months.

noun: plural - summer sacks
pronounciation: 'se-mer'sak

I need a butter knife to scrape my summer sack off my leg.
Can you turn on the A/C? My summer sack is leaking out of my shorts.
by Salty T October 30, 2007
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The elongated version of a human scrotum which appears in searing hot weather conditions.
I just did a video search on the word nekkade and witnessed a ridiculous summer length sack. Why was that guy riding his bike in the nude?
by Lârry Dângüs, esq. May 4, 2010
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The moment when your hairy ball sack begins to sweat in the hot summer sun as they slap against your penis while you're chasing after women wearing thong bikinis.
"Oh my God dude.. That woman was playing hard to get while I was chasing her down the beach when suddenly I got fucking summer sweaty sack... Now it itches until I scratch it. Damn it Beavis.
by TheBIGROD34 April 18, 2016
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