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1.
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 10, 2008
 
2.
A giant, humanoid Piranha Plant that usually wears a pair of polka dotted underwear. Debuted in Super Mario Sunshine
Petey Piranha will pwn you, your princess, and your buddy's princess
by C-T-U June 28, 2008