一个人喝冷咖啡
[yī gè rén hē lĕng kā fēi]
This nickname conveys a sense of loneliness and perhaps sadness. Drinking cold coffee alone can symbolize someone feeling isolated or going through a moment where they are not getting the 'warmth' or comfort that they might seek in companionship or warm drinks. This person could be suggesting they enjoy solitary moments or hint at deeper emotions like being used to being alone.