Balloon Pac-Man is one of Pac-Man's many forms. He becomes this when he eats the purple power berry with a dark red swirl. This has been shown in Is Zit You or Is Zit Me? where Pac-Man confused the inflate berry and the shrink berry.
He looks almost the same from the regular Pac-Man but with a inflated body. Pac-Man's stomach will grow before farting at high speeds.
- 107: "Is Zit You or Is Zit Me?"
Balloon Pac-Man was a direct throwback to the inflation scene in Pac-Man 2: The New Adventures.