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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!
by Chris Gutes August 08, 2012
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Fierro is actually Italian for strong fire. And its an Italian mafia family from Sicily, not Mexico.
That Fierro is a ginnie
by Gambini May 15, 2008
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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.
by mawuto April 28, 2014
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