Top Definition
1. adv - to do an action a lot or to an extreme degree.

2. adj - large quantity, mass, duration, length, volume.
1. "did you see how much pop-corn that guy gave me" "yeah, he hooked you up mad fatty"

2. "throw me some of that mad fatty peanut butter"
by Dr. Vesuvious February 18, 2009
5 Words related to Mad fatty

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