冷不丁的小情绪时不常的坏脾气
[lĕng bù dīng de xiăo qíng xù shí bù cháng de huài pí qì]
Translated literally into 'Suddenly have small mood swings now and then with a bad temper'. It portrays a person whose mood changes suddenly and sometimes gets upset, indicating they might need time and space alone due to unpredictable emotions.