Statement, usually stupid, sarcastic, and/or indicative to a sexually moronic male who uses cheap shots to incite feminine ire. Word play on "dead man walking", i.e., referencing the near-status of said tried, convicted, and soon-to-be-dead male. If said male wished to live, he best STFU.
Guy: (Come-on line)Soooo...ya hear that new blonde joke with the...
Girl: (Interrupting): (yells): Dead man talking!
(All other women in the room lean out or off of their cubicles/workspaces/barstools with a deathglare on their faces)
Guy: Nevermind.
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.