Top Definition
The opposite of shrinkage, when the mail genitals shrink when they are exposed to cold. Growage is not the same as a boner since the penis remains flacid.
That sauna was so hot that I got a major case of growage in there. It didn't hurt that when I stepped out I immediately saw the milf who owned the house.
by B-Peeks February 26, 2010

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