balls of steel
Balls of steel is an idiomatic expression meaning extreme courage, nerve, or audacity — typically admiring in tone.
Seen in the wild
I am SO FUCKING HAPPY for Myles. What an arc this year. Stunning mental toughness for a boy that isn't yet 20 years old. We knew he had balls of steel when he did this, and I should have known he would persevere.
Balls of steel my brother. No Country for Fkg Genocidal Zios.
Definitions
Balls of steel is an idiomatic expression meaning extreme courage, nerve, or audacity — typically admiring in tone. It implies a person is willing to take on high-risk situations without flinching. Used widely in informal speech, sports commentary, military slang, and action movie dialogue. The phrase is gendered by its anatomy-based construction but is increasingly applied gender-neutrally in casual speech to mean sheer fearlessness.
It took balls of steel to walk into that negotiation alone and come out with everything on the table.
Comments
An idiomatic slang expression for exceptional courage, audacity, or nerve, the kind that allows someone to do something most people would find terrifying or foolish. Typically used admiringly, though ironic applications exist. The image implies someone whose metaphorical balls are so hard they cannot be threatened or crushed. Common across English-speaking cultures in informal speech. The phrase is frequently applied after the fact to describe decisions that looked reckless at the time but ultimately paid off.
You need balls of steel to walk into that boardroom with a counter-offer that outrageous.
Comments
(slang, idiomatic, humorous) Courage, audacity.
“I am SO FUCKING HAPPY for Myles. What an arc this year. Stunning mental toughness for a boy that isn't yet 20 years old. We knew he had balls of steel when he did this, and I should have known he would persevere.”
"balls of steel" means: Courage, audacity.. This is informal slang, common in casual speech, texting and social media, but not appropriate for school work, applications or professional settings. There is no real cause for concern in itself; it is everyday peer vocabulary. If your child uses it, a light comment about audience and register is usually enough — no need to escalate. Context, more than the word, tells you whether to follow up.
"balls of steel" means: Courage, audacity.. Register: informal slang, fine in casual conversation, texting and social media but not in academic essays, business writing or formal speech. A common non-native mistake is to use the word in the wrong register, or to assume one fixed meaning when it is actually polysemous; always check the surrounding register and the audience before producing it yourself. In formal writing, prefer a neutral synonym or a short descriptive phrase, and use this word only when you have heard or read it being used naturally in a comparable context.
“I am SO FUCKING HAPPY for Myles. What an arc this year. Stunning mental toughness for a boy that isn't yet 20 years old. We knew he had balls of steel when he did this, and I should have known he would persevere.”
— Bluesky· May 2026“Balls of steel my brother. No Country for Fkg Genocidal Zios.”
— Bluesky· May 2026
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🗺️About Regional & Other slang
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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Semantically related
- balls75%
(uncountable, vulgar, colloquial) Masculinity, particularly strength, courage, and force of will; chutzpah; brazenness.
- brass-balled72%
Slang for someone who displays extraordinary courage, audacity, or nerve — a more emphatic spin on 'brass balls,' itself a way of saying someone has the boldness of metal where softer people might flinch. A brass-balled move is one that requires either tremendous bravery or a spectacular disregard for consequences. It's admiring in tone, though crude in delivery, and typically reserved for acts of genuine daring rather than mere recklessness.
- ballsily72%
An informal adverb meaning in a ballsy manner, boldly, audaciously, and with nerve or daring. Derived from ballsy, itself from balls meaning courage or nerve. Used to describe actions taken with impressive but sometimes reckless confidence. The vulgarity is mild in context; ballsy is widely used even in semi-formal settings and the adverbial form follows naturally. The adverb is used to describe both admirable boldness and reckless foolhardiness, with the speaker's tone rather than the word itself distinguishing the two.