Top Definition
Where you and your friends each eat an entire box of Fiber One granola bars. Last one to, well, last is the winner. Ideally played in a house with one or two bathroom depending on the size of the group.
me My Friends and I did the fiber one challenge yesterday.

you How did it go?

me We had to be careful not to detonate the gas and destroy the house.
by Mad Gasser of Mattoon June 16, 2011

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