A Eunuch is a n00b who generally listens to way too much soft rock, and winds up missing his genetalia.
Eunuchs are pretty much the lowest things in society. For some reason, Chinese Emperors had a Eunuch fetish, which pretty much explains everything. In the end, the Eunuchs had more power than the Emperors, which just goes to show cutting off people's scrotums is generally a bad idea. Some people think that Brian Peppers is a Eunuch, but that is simply not true.
Becoming a Eunuch is also a common side effect of joining a fraternity. So make sure to never take your pants off when the bros tell you to, or you could get pwned like that horse. On the other hand, if you are already in a fraternity, this can be a great way to score lulz off freshman. Think of it as the ultimate haze.
It turns out that Jews are NOT Eunuchs, for the most part. This is a little known fact discovered by several Nazi servants of Adolf Hitler during WWII, which directly led to his suicide. You see, it turns out that Hitler's hatred of jews was almost entirely due to the fact that he thought they were eunuchs. Which they aren't.
Some Famous Eunuchs include:
- Justin Bieber
- Jimmy Carter
- Mel Gibson
- the entire cast for "American Idol"
- Neil Armstrong
- John Travolta
- Colin Powel
- Rosie O'Donnell
- Howard Dean
- Barry Bonds
- Optimus Prime
A video of why not being a eunuch is such a good idea: 
A Castrato is the same as a Eunuch but only when it is done for classical music such as opera.
Now considered illegal to even consider it was once the rage to have a prepubescant boys balls chopped off for singing purposes in countries like Italy because the effects of a castrated boy growing up brought about what many thought was a voice superior to a womans,
A castrato was seen as being superior to a female opera singer because of their flexability, many having the same vocal ranges as women because their vocal cords were never a llowed to mature, had tonal qualities to their voice that, in the day, many felt made them more enjoyable to listen to and with proper training, they had a breath control and lung capacity that was unrivaled by man or woman.
Castratos came to an end in the late Victorian period because SJWs of the day and the Catholic Church thought it was cruel to put a boy through the process. Tastes in music were also changing and since there was little need for Castratos, they fell out of favor and boys were allowed to keep their testicles, at least until they were married.