At its core, “a huevo” is an enthusiastic “hell yeah!” or “damn right!” in Mexican slang. It comes from huevo (which literally means “egg” but is also slang for testicles), but the phrase itself is more about confidence, excitement, or inevitability.

How It’s Used

• Agreement or excitement → ”¿Vamos por tacos?” / ”¡A huevo!” (Hell yeah, let’s go!)
• Confidence or certainty → “Ganamos el partido.” / “A huevo.” (Of course we won.)
• Going all in on something → “Se aventó el proyecto de a huevo.” (He went all out on the project.)
• Something being unavoidable → “Es a huevo.” (It’s mandatory.)

Is It Like “Balls Out” in English?

Kind of! “A huevo” carries the same bold, all-in energy as saying someone went “balls out” or was “ballsy” in English. The difference? It’s mostly positive—it’s about confidence and enthusiasm, not risk or recklessness.

Where Is It Used?

This phrase is 100% Mexican Spanish, but it’s also common in Tejano Spanish and among Mexican-Americans, especially in places like Texas and California. It’s casual, fun, and definitely not something for a formal setting—but if you’re hanging with Spanish speakers, throwing in an ”¡A huevo!” at the right moment is a solid way to sound in the know.

From ChatGPT.