Sorry to be voice of reason,
, yes, I know it's a first, but feel that we ought to clear this up to avoid the Clique label!
My understanding is that a "stiff git" came about due to a typo or fat finger episode, and was meant to be a "stiff g&t", as in gin and tonic.
"And, so it came to pass that the wise people of GN took the stiff git to their bosom, (be those bosoms large or small) and embraced it, and henceforth it replaced the stiff g&t that was previously lauded and treasured by some (although not the drinkers of Chablis, Cava and other such hallowed beverages) and the members drank of it, and it was good"