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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..
Are you a Fierro or something Dale?
Fierro by anonymous March 26, 2021