The idea comes from the practice when two girls go down on a guy. Since both girls cannot pleasure the head of the penis at the same time, one girl is forced to take the shaft of the dick. Hence, the word shaft or shafted referring to being screwed into a lesser deal or something not as desired.

An awesome drink that you can order only in Lake Louise at the B&G (only bar in town). Kahlua, vodka, coffee, cream, sugar.

Others insert the pill into the anus where it is absorbed. This process is known as “shafting.”

Splitting your pants so badly that your dick falls out.

Getting the bad part of a bargain. It comes from the song: "She Got the Goldmine (I Got the Shaft)" written by Jerry Reed.

SNIPPET:
She got the goldmine (She got the goldmine)
I got the shaft (I got the shaft)
They split it right down the middle
And then they give her the better half
Well, it all sounds sorta funny
But it hurts too much to laugh
She got the goldmine, I got the shaft

1 Familiar name for a landmark at Georgia Tech called the Campanile.

To be hanging out with a group of friends, then left out of all conversation and jokes while friends continue like you aren't even there.