1. Am acronym for "gallon of milk a day". A method used by practitioners of bodybuilding to put on significant amounts of muscle by consuming a gallon of milk, every single day.
Frequently used in a facetious manner, denoting the ridiculous lengths people go to for the purpose of bulking up.
Hey man, I did squatz and GOMAD and I bulked up like crazy!!
de Memz0rz 7 janvier 2010

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