What is "meraklije"

Meraklije are the organized supporters of the Niš professional football club Radnički Niš, and are one of the major supporter groups in Serbia. Meraklije is plural of the singular form meraklija, which means something like "neko kome je sve po meri, neko ko uživa u nečemu", which roughly translates to "someone to just everything is right, someone who enjoys something"; a person in this state is called a meraklija. Besides the football club, they also support other sport sections in Niš. They are also known for their special support to the Serbian national handball team.