TJ Maxx is a store that sells heavily discounted clothing for various reasons such as out of season, out of style, or some kind of defect in the garment.
When someone is TJ to the Max, that means they are wearing clothes that may have one of the above characteristics. It is a pun of being "TJ" which is Tijuana, Mexico and dirty or old.
Jessica: Did you see Jose sporting that fresh gear?
Edward: Man, that fool is TJ to the Max. He can't afford nothing, besides his Rockawear pants are missing the leather logo belt loop on the back, probably got it on clearance for that defect.
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.