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Spanish for iron but in Mexico it has slang meaning either as "Fierro Pariente" which literally means iron relative and is when saying to a close family or freind. Also mean Ok, like for example.
¿Puedes trae las chelas alla en el rancho?
"Fierro"
Can you bring the beer from the ranch?
Yea
Fierro by CompaCruz November 14, 2019
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1. The slang term for a penis longer than 8 1/2 inches.
2. A penis which has a unique maneuverability, almost a mind of its own.
3. A snake disguised as a penis.
Samir: Jeez, look at his Fierro!
James: I know, i can see it through his jeans!

Tony: Did you see how i used my Fierro?
Kevin: Yeah, it was a very convincing puppet!
fierro by Chris Gutes August 9, 2012
Fierro is actually Italian for strong fire. And its an Italian mafia family from Sicily, not Mexico.
That Fierro is a ginnie
Fierro by Gambini May 15, 2008
Strong Mexican mafia family, construction company, Yard work, and nucular powerplant owner
That Michael Fierro Is a BEAN
fierro by Lindz G January 23, 2008
A male person who performs the act of ass eating.
Person 1: Look its andrew.
Person 2: I don't like him! He's a fierro
Person 1: omg really that's disgusting.
fierro by mawuto April 28, 2014
Fierro is now a verb (derived from the MCGA book character Alex Fierro) for:

1. to do something badass
2. to roast a (queerphobic) cishet
3. to decapitate someone

thank you, and have a nice day.
For Definition 1: Most of Gen Z tend to take pride in fierroing (I had to be creative here, okay?)

For Definition 2: "Did you see them fierro? That Karen was completely WRECKED, don't you think?" He told xem. (yes, neopronouns exist)

For Definition 3: Fierroing someone is a crime in all places, with the exception of Valhalla.
Fierro by Z—Yeet September 10, 2021
Term for being mentally fucked..
Fierro by anonymous March 26, 2021