A Person who has a very Girthy cock.
"Oh my Days.........have you heard about the Girth on that Facevader? People call him Girthvader! Its wider than my Nans remote Control!!!
by Facevader Girthvader May 16, 2012
A very obese fan at a Star Wars convention wearing a Darth Vader helmet with voice changer.
Look at the fat ass over there in the Darth Helmet. That must be Darth's larger brother, 'girth vader'
by Florida Sunshine November 09, 2009