骚不住就别矜持
[sāo bù zhù jiù bié jīn chí]
'Be naughty if you cannot hold it, don't pretend' is a humorous way to express being spontaneous and unrestrained, not holding back just to keep up an appearance. It implies that if someone can't stay formal, they should give up trying, embracing a free-spirited and authentic way to interact online.