When the generally ignorant, gun toting, beer drinking, tobacco chewing, spit swearing, tattoo wearing, etc. aka red neck declothe and nakedness runs rampant. It is usually accompanied by consumption of large quantities of alcohol (usually no-name budget beer) and blinding white bare asses or at least blinding white butt cleavage.
I went to a waterpark in Whitetrashville and was blinded by all the red neckedness.
After having too much to drink, the trailer park was over run with red neckedness.
Tasha: Tell everyone I say hi!
Bryan: I don't think I will do that.
Tasha: Your a butt head!
Bryan: I don't think I am.
Tasha: you won't tell everyone I said hi! That constitutes as butt headedness!
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.