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!
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