去尼玛矜持去你爸蛋定
[qù ní mă jīn chí qù nĭ bà dàn dìng]
'Qu Ni Ma Jin Chi Qu Ni Ba Dan Ding', this is quite informal, literally translating to something vulgar, meaning let go of restraint and show one's true self without worrying too much, often used humorously in daily conversations.