Also known as Old-Skool or 0ldSk00l (If you insist on calling it that, you Don't Belong). Can be something or someone who is of an older group or class. A SiliconGraphicsIndy might be considered OldSchool - a SiliconGraphicsIndy owner can only be called that if they owned it when they were cool, back in the day.

BBS use is definately old-school.