Like a hardliner - a right-wing "old school" GOP supporter who is immune to facts and solely focused on a conservative agenda, irrespective of long term ramifications to society, common decency, or human rights, and with a heavy dose of diminished mental capacity. The opposite of "libtard".
Oh, hey, I'm so sorry about my friend Jim from high school. He's a good enough guy but is a bit of a tardliner - I wouldn't recommend discussing oppression or wealth distribution with him.
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.