It's Chinese English. In Chinese, 'Zhuang' means 'play'. 'Bi' is 'pussy' in English. Literally 'zhuangbility' means 'to play pussy' or 'state or action of playing pussy'.
Zhuangbility means 'to boast' or somewhat in English.
Many people think they are full of niubility, and like to play zhuangbility, which only reflect their shability.