开口就素尼玛的女孩在
[kāi kŏu jiù sù ní mă de nǚ hái zài]
The nickname uses colloquial expressions that include swearing in Chinese. It translates roughly as 'A girl who swears easily', giving off an edgy and defiant vibe, perhaps implying this individual has a very candid, unconventional or even rebellious side.