薄荷加冰多心凉柠檬加醋多心酸
[bó hé jiā bīng duō xīn liáng níng méng jiā cù duō xīn suān]
The username means that 'mint with ice makes one feel cool just like unrequited love makes one feel cold; a lemon with vinegar makes one's heart bitter just like the pain of loving in vain'. It describes feeling of loneliness or being misunderstood.