Top Definition
An unnaturally bulbous and heavy penis head, causing the shaft to perpetually bend towards the floor. This bending occurs at all times, even during erection and usually presents all sorts of problems when being blown.
When Kim was attempting to blow me last night, I accidentally bruised her forehead and gave her a black eye with my Girth Hammer! She concussed shortly thereafter...
by Girth Himself January 24, 2009

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