That infamous promiscuous female in any circle of friends, whose pussy just goes around eating all the cock it can get its lips around.
That chick has slept with half the damn city, talk about some major piranha pussy!!!!
by Thewop November 2, 2007
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Slang for the break room of an office. Called this because when a cake, cookies or other goodies are left out, the office workers tear into it like a Piranha on fresh meat.
Sally: Are those girl scout cookies?

Betty: Yes, I bought them from the neighbor girl.

Sally: Don't leave them in the Piranha Tank or you will never see them again.

Cristi left her day old donuts out on the table in the Piranha Tank and they did not last til noon.
by B. Hanback April 3, 2008
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The term for when a guy gets a girlfriend and immediately becomes desired by other girls. It is a sociological phenomenon involving social status, showing that the man is okay to be desired. He has been approved by a sociological microcosm as a man who would make a good mate. It also involves competition, the guy is almost a prize now, something that can be won in a competition.

Once one piranha bites, they all swarm.
Single guy walks down hallway, girls barely notice. Guy gets with hottie and now girls can't stay away.

Guy's Friend: Man, the piranha effect worked wonders for him!
by wackojakko January 4, 2011
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When a woman is eating your ass and starts biting your taint.
Last night my girl was tossing my salad and started biting my taint like a wild fucking Gooch Piranha
by Carltrain July 14, 2018
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A surprise grabbing of the crotch in any body of water.
Though pleasantly surprising some, Nicholas was ultimately banned from the public pool for routinely giving swimmers a sneaky piranha.
by shudder inc May 30, 2013
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A giant freakish-looking plant-monster that is clad in nothing but red and white polkadotted underwear. Attacks by either puking up toxic sludge (in Super Mario Sunshine) or by leaping up and stomping down, and swinging cages which are permanently welded to its arms (in Super Smash Bros. Brawl). Has also been spotted playing golf for some reason.
Petey Piranha: "ROOOOOAR *swings cages*"
by Ricky Romero July 11, 2008
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A breastfed child with teeth that comes at your breasts like a piranha comes at its prey
*breastfed child comes toward mom's breasts*
NOOOOO, GO AWAY, YOU TITTY PIRANHA
by danicuntcake April 11, 2015
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