A fork of Rural Dictionary
girth inch, the length of the circumference of a penis
"Dude, I couldn't bottom last night--that guy had mad ginches."
Ginch is an adjective. If someone were to be Ginch, they would have to be pretty awesome and somewhat cool. Typically used to describe how impressive someone is.
Man, do you see Matt hitting that half pipe? Man he's handling that like a boss. Matt is actually so Ginch.