Erbility (pronounced er'biliti) is a Chinglish noun, means ability of being a jerk or douchebag. Er means
two, and
bi (pronounced bee) means pussy or cunt in
Chinese. But when they are combined, erbi (pronounced 'erbee), it means very stupid and retarded. Now just like niubility or zhuangbility, Chinese started to say erbility for fun, in order to make the word more sounds like an English.