Top Definition
When a single man is offered a pair of used jeans that should fit and he discovers they don't. This discovery prompts the individual to lose forty pounds over a pre-determined period of time, thus beginning the forty pound challenge.
Austin: Hey Ace, try on these pants, if they don't fit I'm gonna toss them.

Ace: Damn, these are way too tight. They would have fit a few years ago, I guess it's time to start a forty pound challenge.
by Tarbargain January 14, 2014
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