南以蓝暖c北以晨安c
[nán yĭ lán nuăn c bĕi yĭ chén ān c]
'Southern skies blue and warm, northern morning calm' likely depicts an idealized scenario or feeling where southern scenes are tranquil and blue (suggestive of sea/sky), whereas north has peaceful mornings. c could stand for 'city'. This internet nickname reflects nostalgia and fondness for both southern and northern sceneries/feelings.