noun: 1. a term used to describe ones toolbox after multiple jelqing sessions. 2. An object or thing that has a larger circumference than length.
After 40 strokes of jelqing per day, Sob's girth increased from 3" to 6".

After taking some megapump5000 girthexplodetron powder, Alex's biceps became massive girthzillas.
by akmoneyy August 10, 2009
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A super big cock with a huge circumference, used to pound pussy. It is usually associated with a Pete North sized load that spews out onto a woman's face.
Sean: Dude, I just don't know how you do it. You're always slamming box.

Sam: Yea, well when you have girthzilla pipe like me, you can do whatever you want and girls will be pulling their pussies out all the time and begging to give you bobbles and the ole fashioned hand jobs.
by Richard N. Cheese January 28, 2011
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