The part of a man's penis that is hidden from view either under the pubic mound or above the testicles. The inner shaft is not seen but is felt during intercourse.
Kianna: "My God has it gotten bigger?
Joe: "Nah baby that's just the inner shaft. It'll sneak up on ya!"
Joe: "Nah baby that's just the inner shaft. It'll sneak up on ya!"
by elpolorico November 15, 2015