to be understanding/concentrating on something really well
Dude, I was totally on the ball in chemistry class today!

Yeah I got an A+ on my test yo, I was on the ball that day!
by Dasha March 02, 2005
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A redneck measurement of power. The equation is (Bhp + ft-lbs torque)/22.8.
Billybob: My truck has got some major balls!
Bubba: How many?
Billybob: Well, (325 hp+450ftlbs)/22.8= 34 balls!
by Ganjaninja1031 March 29, 2016
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1. A man's testicles where sperm is produced.
2. Courage or bravery.
3. Manliness.
4. Something yelled to shock people.
1. During oral sex Jackie licked Ed's balls.
2. He didn't have the balls to jump off a three-story platform into the water.
3. He may look sexy, but Dereck doesn't have balls.
4. The boy said to his grandmother: "Balls!" And she passed out.
by Anonymous June 29, 2003
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This expression is most commonly used in America. It can be used as another meaning for "You won't do it" or "You won't".

It overall means, you have 'no balls so you won't do it.'
"Dude, I'm going to message her!"
"No balls, you won't"
by yogurtz April 09, 2019
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when someone doesn't have the guts to do something.

For effective use: obnoxiously yell “NO BALLS” when someone is attempting to explain their reason why not to do something totally stupid.
nikkii: "but i don't want to eat an ant"
hanch: "NO BALLS!!!"
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