酸性脾气碱性煽情
[suān xìng pí qì jiăn xìng shān qíng]
Means 'acidic temperament alkaline sentiment.' It's a poetic expression indicating a personality which has a tendency for emotional highs and lows—tending to have mood swings between acidic (sour-tempered) to more sweetly moving someone's feelings (sentimental).