Lucas James Black's definitions
The base of a penis that is normally covered by the scrotum that becomes exposed when the scrotum swings upward towards the face. This is commonly seen when the man is upside down and erect.
My friends and I noticed the exceptional girth of dick spine on an Ecuadorian gay man's penis while he was getting rammed.
by Lucas James Black February 18, 2011
Get the Dick Spinemug.