When you have a hard-on and you accidentally contort your penis in a way that causes discomfort or pain.
Friend 1: Dude, I had the biggest boner yesterday after school and when I climbed over a fence to take a shortcut to my house, my dick felt like it broke in half.
Friend 2: Bro, sounds like a total shaft snapper.
Friend 2: Bro, sounds like a total shaft snapper.
by MattyK717 January 7, 2016
Get the shaft snappermug.