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15.
In rugby when the other team sees the ball has left the scrump
"balls out," go tackle him
by tuce February 17, 2004
24 50
 
16.
(adj) describing an extreme effort, supposedly dangerous.

Analagous to "sticking one's neck out," but with a more important (allegedly) piece of anatomy
Man, Brian drove balls out around that corner, I thought I was gonna die.
by Zoroaster December 12, 2003
27 58
 
17.
By far the most extreme example of.
This is balls out the coldest day ever.
Your car is balls out the coolest.
by Chives November 25, 2003
10 50
 
18.
when you forget to zip up your pants
Marc - " FUCK Man zip up your pants your hanging balls out"
by shane-d August 03, 2007
20 64
 
19.
Squirrels are known to have a large testicle-to-body-ratio, i.e. they have lage lesticles in relation to the body. During mating season, male squirrels fight for females and territory. During such fights, the male squirrel tucks away his testicles into a furry pouch in order to protect them. Sometimes, however, a male is suprised by a rival and must fight quickly, leaving no time to tuck away the testicles. Consequently, the squirrel has to fight "balls out," a term that has come to refer to heated, all-out confrontations in the human world.
Wow, that squirrel there snuck up on the other one and made him fight balls out. Guess that settles that procreation conflict for the next few weeks.
by darwinlinguistics March 02, 2008
30 75
 
20.
Whenever balls, nuts, or testicles are showing and are bouncing or swaying in the wind. See flapnut
Little Jimmy found it funny to have his balls out in church, little Sally shit her pants in the excitement.
by Alexei March 20, 2003
19 67
 
21.
This is a serious condition that effects many athletes, it occurs when a sprinter wears very short shorts and then sprints. What happens is his nuts flap outside the shorts and are clearly visible to all. It is disgusting and must be prevented at all costs.
When Calin jumped long jump he always went balls out and never wore spandex underneath his shorts, hey it pays to advertise.
by ShoesRBad March 20, 2003
61 109