Or if you want you want to get all fancy, wikipedia's definition:
Chubby bunny is a recreational game that involves the placement of increasing number of marshmallows or similar items into one's own mouth and stating a phrase that is intended to be difficult to utter with the filled mouth. It is often played where marshmallows are readily available, including around a campfire when camping with a group of people.
For me, marshmallows are readily available around any holiday in my favorite form --- Peeps! I'm probably one of three people on the planet that actually like these energy packed, sugar coated goodies.
Anyways, some of my co-workers had never heard of this game and I used to love it! We'd play in Sunday School (don't ask why) and I would usually win. My boss bought me some ghost Peeps and now I'm seriously contemplating having a Chubby Bunny Challenge for our Halloween Luncheon this Friday.....who's up for the challenge?!?