Top definition
The average penis is anywhere from 5-6.5 inches in length and 4.5-5 inches in girth (around, circumference) when erect. Flaccid length varies, so any measurements of a flaccid penis doesn't really reveal any information.
Friend 1: I am sad because my penis is only 5 inches long!

Friend 2: Man, don't worry, nerves in women usually only go about three inches past the vaginal opening, there's a reason most men are 5-6 inches long- any more is practically a waste of space! It's fine, you have an average penis.

Friend 1: Yay! Also, I'm only 3 inches around!

Friend 2: Well, that just sucks.
by girth_brooks February 14, 2010
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