Original poster https://www.lifewire.com/what-does-o-p-stand-for-2483372 http://www.urbandictionary.com/define.php?term=op
http://lmgtfy.com/?q=what+is+op+on+forums
A repack is where you wont get support. It's a pre-comiled server package for people that are incompetent on building their own server. You get no updates, you can't fix core problems, and most of the time they are extremely outdated with so many bugs locked into a pre-compiled core that you have to deal with.
@Chrisseria2520 You said it best... You just explained that you had a negative experience with a repack (one of the largest) You had a guy that was able to cheat and hack your "repack" and there wasn't a single thing that you could do, due to someone else that created the server in a package nad not able to add special detection and core functions within a repack.
Look... People are lazy, i'm not saying you are. But don't let one small issue you run into block you from giving up. It's very very while worth it to compile your own server. Not only can you make custom modifications and keep your package up to date, but you will learn a lot from it and have the confidence to tell your friends that you may be able to fix a certain issue - since you will get support.