狐狸未成精骚的很
[hú lí wèi chéng jīng sāo de hĕn]
It's used humorously referring to 'an inexperienced/young fox that still causes a mess.' In folklore, foxes turn into spirits with special powers after they reach a certain age. Here this means someone not very adept but still causing trouble, or being overly showy despite lack of skills