Top Definition
The girth monster is a penis that is small in length but large in girth (8-12in) with the pubes cut into a flattop .
Also called girthzilla, girthakazoo, granddaddy's girth, girth daddy, grandmaster girth, girth girthy goo, girth brooks, gurgly girth, and the Chicago grandslam
My girth does the job

Did you see coach over there with his girth monster blushing out of his pants
by Girthmonster March 20, 2015

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