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A voracious, predatory, highly competitive, ruthless, alpha male/female.
Often misspelt Pirhana
From the 'Apprentice'. One contestant observing the fish swimming at the London Aquarium, mused to a finalist'They're piranhas? But they look so friendly' You haven't seen their teeth' the finalist replies wearily. After 12 weeks in pursuit of the coveted job,he was covered in the nasty bite marks of his fellow contestants.
piranha by Henley December 29, 2008
noun: Any wrestling or grappling technique (esp from Brazilian Jiu-Jitsu) that presses a body part or the ground against your mouth - sometimes yielding imprints of your teeth on the inside of your lips/gums or teeth marks on your opponents arms/legs.
No piranha moves today - I forgot my mouth guard!
Piranha by Yet another victim July 15, 2011
A woman that fights or grapples (especially a practitioner of Brazilian Jiu-Jitsu) that is known for being very fast and vicious.
She's a really sweet girl until we get in the octagon - then she becomes a piranha!
Piranha by JennySea August 5, 2011
adj: A determined, sneaky and fast opponent that is very hard to get rid of once they acquire their target.
That guy's a piranha if you have to fight him - he'll beat you down no matter how long it takes.
Piranha by Bill Just Bill July 5, 2011
A piranha ate my couch.
Piranha by Kingfurby77 December 30, 2016
1.s. f., Ictiol., Brasil,
teleósteo water fish cutting tooth candy, characterized for an extreme voracity and that it can constitute a real danger in the rivers and lakes where lives, therefore demonstrates great predilecção for animals that bleed;

2.Ornit.,
Brasilian black bird of Amazon;

3.gír.,
woman of libertine habits.
(3) --> Her girl is a piranha!
piranha by aamap August 27, 2006