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when all six abs merge together. classy way to say beer-gut.
Person 1- wow, that guy in mcdonalds is so fat!
Person 2- no way! he just has a mono-ab.
by celestinator June 06, 2010
1 large ab formed from beer and over indulgence
Look at the Mono ab on him
by gryphonhearted April 28, 2010