The optimal connection, configuration, or grouping together of multiple entities so as to provide the greatest overall value.
"Sweet xarba! I like how Tiesto blended those tracks together like that."
"We don't want that bus! That's bad xarba because it makes all the stops between here and 24th street and then we've got to switch to another bus to get to downtown. Just wait and take the express bus that's due in 5 mins."
"That mage needs to learn it's bad xarba to tag the boss before the tank gets a chance to generate enough threat."