都是白开水装什么优乐美都是酸奶装什么特仑苏
[dōu shì bái kāi shuĭ zhuāng shén me yōu lè mĕi dōu shì suān năi zhuāng shén me tè lún sū]
'They're just water, why pretend to be Ueleme (coffee brand) / They are yoghurt drinks not Tellunsu (yogurt drink brand)', it’s a metaphor for people pretending to be something they're not, often used sarcastically against those faking classiness or superiority.