没萌就别在我面前萌没酷就别在我面前酷
[méi méng jiù bié zài wŏ miàn qián méng méi kù jiù bié zài wŏ miàn qián kù]
'Don't act kawaii if you're not actually cute; don't show off coolness if you're not truly cool'. This expresses a feeling of disapproval or frustration towards inauthentic displays of personality, essentially telling others only express qualities genuinely held.