When I was a kid, I attended a small private Christian school. (Maybe that's not the best sentence to open with considering this post's title, but hey....) It was so small that, in my first grade class of 9 students, there were no girls.
We were all very close at the time. Sure, there were a few dorks (Peter, Evan) in the group that we all picked on. And a couple of us (Danny, Joseph, me) mighta sorta been bullies and I might have once - maybe - hit a kid in the face with a flat dodgeball and made him cry. But we were always invited to each other's birthday parties, we had a clubhouse in Joseph's parents' toolshed, and we would slink around at church potlucks like a gang of little James Deans, dressed in our Sunday best. We were inseparable, but let's be honest - mostly it was because we didn't have a choice.
In 6th grade I moved to public middle school. Some of the kids moved to different states. We were pen-pals until the weather got warm or until we forgot to write anymore. We lost touch. I don't even know how I would search for their contact information anymore.
If I had grown up in Korea, this band of 9 little Christian brothers would be my "불알친구". That means, quite literally, "testicle friends".