别在我面前装靓别在我面前装帅
[bié zài wŏ miàn qián zhuāng jìng bié zài wŏ miàn qián zhuāng shuài]
It literally means 'Don't Act Cute In Front Of Me' (both 'being cute and handsome are meant). It can be taken as the user disapproving fake or showing-off behaviors around them.