The V sign, when the palm is facing toward the person giving the sign, has long been an insulting gesture in the United Kingdom, and later in Ireland, Australia, New Zealand and South Africa. It is frequently used to signify defiance (especially to authority), contempt, or derision.
大概是fuck off 的意思。
平凡之路里面郭麒麟不是说现在为了防止通过照片盗用指纹，都建议手朝里吗？
哈哈， 还有这事。