A little pearl likeball, in a Blackberry (cellular phone), which makes navigating easy, but can fall out if you don't take care of it, which is a pain in the ass.
1. A condition which occurs when a male running in a track meet fails to wear supportive underwear, and the testiclesbounce freely.
2. The plural for a type of computer mouse that involves a stationary ball that rotates to move the cursor.
1a. "Man, I wore boxers instead of tighty whities when I ran the 1600-meter today. I've got a bad case of trackballs."
1b. "John didn't want to have sex; I thought it was because he was cheating on me, but it turns out he just had a bad case of trackballs after freeballing it at the track meet."
2. "I prefer trackballs to typical mice because I'm a loser that plays World of Warcraft 24/7."
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.