Gavin McMullen is of scottish ancestory from the clan McMullen. Usually people with this name are very sucessful in life as doctors or lawyers. Typically very out spoken, very charming, incredibly good looking and very physical. Also anyone named Gavin McMullen has an extemely large cock, around 15 or 16 inches in legnth and 5 inches in diameter and are amazing in bed.
Wow that Gavin McMullen is a great guy.
by CarlosSpicyWeiner999 December 21, 2010

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