Circumcised penis / Man with a circumcisedpenis. Due to the fact that the head of the cock becomes less sensitive after circumcision. Can be viewed as a good thing as sex lasts longer, or a bad thing as the sensation is diminished.
"Worst mistake of my life becoming a dead head, it's like jerking off a piece of dried up old leather"
"My girlfriend loves it since they cut me after my foreskin split on us. Now I'm a dead head she actually gets to cum. Sadly, I don't"