The act of using a semi hard erection to penetrate one's own ass, then getting fully erect when inserted.
You guys go ahead with the orgy, I'm going to go give myself a Hungarian horseshoe in the corner and watch.
A Hungarian horseshoe is an act where one gets mid-erect and inserts own penis into own butt then pleasures himself.
You guys go ahead with the orgy, I'm going to give myself a Hungarian horseshoe and watch.